diff --git a/README.md b/README.md
index b15f091..56b9b51 100644
--- a/README.md
+++ b/README.md
@@ -44,3 +44,8 @@ a second production monitoring plane. The package records private installation
 and restore proof; delivery acceptance remains blocked in RTEL-WP-0002-T04.
 The [Prometheus mapping](docs/prometheus-mapping.md) supplies a tested report
 exporter and failure/absence rules for package integration.
+
+The [email acknowledgment component](docs/alert-acknowledgment.md) records an
+explicit Railiance admin confirmation with a durable audit-core outbox. It is
+not activated. Identity/policy adapters are implemented; native package admission,
+SMTP password custody and recipient proof remain under T04.
diff --git a/contracts/alert-acknowledgment.json b/contracts/alert-acknowledgment.json
new file mode 100644
index 0000000..05b5b2b
--- /dev/null
+++ b/contracts/alert-acknowledgment.json
@@ -0,0 +1,43 @@
+{
+  "schema": "railiance-telemetry.alert-acknowledgment.v1",
+  "status": "implementation-candidate-not-activated",
+  "workplan_task": "RTEL-WP-0002-T04",
+  "recipient": "bernd.worsch@gmail.com",
+  "role": "railiance-admin",
+  "role_assignment": {
+    "requested_by": "Bernd Worsch",
+    "requested_on": "2026-09-28",
+    "identity_owner": "net-kingdom/key-cape",
+    "directory_username_candidate": "tegwick",
+    "verified_issuer_subject": null,
+    "applied": true,
+    "email_is_authority": false,
+    "directory_group": "railiance-admins",
+    "signed_role_claim_verified": false,
+    "issuer_mapping_deployed": true
+  },
+  "tenant": "tenant:platform",
+  "actions": [
+    "read",
+    "acknowledge"
+  ],
+  "resource_type": "telemetry-alert",
+  "policy_owner": "flex-auth",
+  "browser_origin": "https://telemetry.coulomb.social",
+  "browser_path": "/ack/alerts",
+  "callback_candidate": "https://telemetry.coulomb.social/ack/auth/callback",
+  "client_id_candidate": "railiance-telemetry-admin",
+  "sender": "Alertmanager native SMTP email integration",
+  "receiver_name": "railiance-admin-email",
+  "audit_source": "railiance-telemetry",
+  "audit_class": "telemetry.alert.acknowledged",
+  "audit_evidence_kind_proposed": "load-bearing",
+  "audit_write_only": true,
+  "audit_registration_applied": false,
+  "acknowledgment_resolves_alert": false,
+  "acknowledgment_silences_alert": false,
+  "from_address": "platform@coulomb.social",
+  "from_mailbox_status": "created-by-founder-password-custody-pending",
+  "smtp_kv_path": "platform/workloads/railiance-telemetry/smtp",
+  "smtp_password_field": "SMTP_PASSWORD"
+}
diff --git a/docs/alert-acknowledgment.md b/docs/alert-acknowledgment.md
new file mode 100644
index 0000000..f87503b
--- /dev/null
+++ b/docs/alert-acknowledgment.md
@@ -0,0 +1,163 @@
+# Email receipt acknowledgment
+
+The founder authorized email to `bernd.worsch@gmail.com`, a Railiance admin role
+filled by that user, controlled failure/absence drills and acknowledgment audit
+records on September 28. This work remains under RTEL-WP-0002-T04; no new task
+or workplan is needed. The machine-readable record is
+`contracts/alert-acknowledgment.json`.
+
+## User flow
+
+Alertmanager sends an email containing a link to one alert occurrence. The link
+opens a review page at `https://telemetry.coulomb.social/ack/alerts`. Sign-in uses
+the existing estate identity provider. A Railiance admin presses **Acknowledge
+receipt**; the page confirms local recording and separately reports whether
+audit-core has accepted its audit event. Clicking again returns the same record.
+An email scanner or preview GET never acknowledges anything. Acknowledgment
+does not resolve the fault, silence Alertmanager or suppress its repeat emails.
+
+The link contains the Alertmanager fingerprint and original start timestamp,
+not a bearer credential. A fresh occurrence needs a fresh acknowledgment, even
+if its labels/fingerprint are identical. The timestamp template preserves
+RFC3339 nanoseconds. The corresponding webhook must arrive first; an early
+click reports that the alert has not arrived and can be retried.
+
+## Implemented component
+
+`scripts/alert_ack.py` supplies a WSGI component with authenticated `/webhook`
+and protected GET/POST `/ack/alerts` routes. It requires server-side identity
+and authorization adapters at construction. `alert_service.py` supplies the
+Waitress runtime, `alert_identity.py` supplies OIDC code/PKCE sessions, and
+`alert_policy.py` validates native Flex Auth decisions. There is no anonymous
+mode, trusted-email/header fallback or default allow decision.
+
+The private SQLite store commits the first human acknowledgment and exact
+audit envelope in one transaction. Ordinary updates/deletes of acknowledgments,
+alerts and audit payloads are refused. This does not protect against a database
+administrator. Duplicate webhook calls and clicks preserve the original fact.
+Only bounded alert name, fingerprint, start time and a digest of labels persist;
+annotations and arbitrary alert details are not copied into email or audit.
+
+`scripts/alert_audit.py` supplies a bounded, redirect-refusing sender for
+`POST /v1/events`, with stable `Idempotency-Key`. Credential provision remains
+external. Exact `202 accepted` or `200 duplicate` and `audit:<event-id>` are
+required for delivery completion. Lost replies retain the event for replay;
+schema/auth/conflict refusals retain it as blocked. The package must expose
+pending/blocked debt and explicitly requeue a blocked row after repair. It must
+schedule bounded drains and per-class reconciliation/heartbeat before claiming
+live audit operation. The runtime drains every 30 seconds and reports readiness false while audit
+debt remains. Per-class reconciliation/heartbeat and independent readback remain
+activation gates. No retention deletion is installed.
+
+## Identity and authorization binding still required
+
+The email address is the notification destination. NetKingdom records associate
+it with directory username `tegwick`; the explicit `railiance-admins` membership was applied using the native
+identity-provisioner, preserving other memberships. KeyCape commit `1164f65`
+was built, published and deployed successfully. A real login must still verify
+the signed `(issuer, subject)` and role claim. Do not grant on an email match, domain match or client-supplied
+header. Do not automatically equate `net-kingdom-admins` with `railiance-admin`.
+The requested role is consumed here for `read` and `acknowledge` on platform
+telemetry alerts; this integration grants no unrelated estate privileges.
+
+The package must bind a registered OIDC Authorization Code + PKCE session with
+verified signature, issuer, audience, nonce, expiry, human provenance and MFA.
+Keep tokens server-side; use Secure/HttpOnly/SameSite cookies and logout/expiry.
+Populate `Actor` only from that verified session, with a random session-bound
+CSRF value. The component separately enforces human/platform/role constraints,
+session expiry, exact form Origin and CSRF. These are additional restrictions,
+not a substitute for the policy decision.
+
+The Flex Auth adapter must request a fresh decision for every read or acknowledge,
+with system `railiance-telemetry`, resource type `telemetry-alert`, resource
+`alert:<occurrence-uuid>`, tenant `tenant:platform` and verified subject facts.
+It must validate the native decision contract, exact actor/resource/action
+binding, submitted request digest, admitted package/version/digest, lifetime
+and supported obligations before returning the component's bounded receipt.
+Both adapters are implemented. Signed RSA issuer fixtures exercise the browser
+flow; the native Flex Auth evaluator validates exact request digests and rejects
+wrong identities, missing roles/groups and stale MFA. These tests use synthetic
+credentials and do not prove live authentication. The package must still admit
+the OIDC client and enforced Kubernetes TokenReview caller.
+
+## Concrete activation packet for existing owners
+
+| Owner | Required binding |
+| --- | --- |
+| NetKingdom / key-cape | Register `railiance-telemetry-admin` and exact proposed callback `/ack/auth/callback`; verify Bernd's subject; apply and verify `railiance-admin` membership and MFA claims. |
+| flex-auth | Admit workload caller, telemetry-alert resource and read/acknowledge package/assignments; return pinned package/version/digest and positive/negative fixtures. |
+| railiance-platform | Provision dedicated SMTP, webhook and audit-sender custody through approved lanes; do not extract or copy email-connect's invitation credential into this app. |
+| audit-core | Register source `railiance-telemetry`, exact tenant `tenant:platform`, write-only, `secret_policy=redact`, proposed load-bearing class; admit ingress and independent readback. |
+| rapp-telemetry | Package session/PDP adapters, audit drain/debt monitoring and private persistent state; route `/ack/` separately from Grafana, keep `/webhook` private; integrate SMTP/template/webhook and verify restart/restore. |
+
+Use Alertmanager's native email integration with recipient
+`bernd.worsch@gmail.com`, From `platform@coulomb.social`, template `railiance.alert.email` from
+`templates/alert-email.tmpl` and receiver name `railiance-admin-email`.
+The same receiver's webhook posts to the private acknowledgment service using
+a dedicated credential file. Route only alerts with `owner=railiance-telemetry`
+until other inventories are reviewed; the receiver rejects other scopes.
+The package overlay has this shape (the private service and mounted credential
+paths are candidates, not deployed resources):
+
+```yaml
+templates:
+  - /etc/alertmanager/templates/alert-email.tmpl
+receivers:
+  - name: railiance-admin-email
+    email_configs:
+      - to: bernd.worsch@gmail.com
+        from: platform@coulomb.social
+        require_tls: true
+        text: '{{ template "railiance.alert.email" . }}'
+        send_resolved: true
+    webhook_configs:
+      - url: http://telemetry-ack.telemetry.svc.cluster.local:8080/webhook
+        send_resolved: true
+        http_config:
+          authorization:
+            type: Bearer
+            credentials_file: /etc/alertmanager/secrets/telemetry-ack/webhook-token
+```
+
+The overlay must retain existing routes and supply approved global SMTP
+smarthost/from/auth settings. Do not enable it with an unimplemented browser
+adapter or assume the credential file/service already exists.
+Use SMTP STARTTLS and mounted credential files through the package-owned secret
+references. The existing email-connect lane proves IONOS is available but does
+not admit a new SMTP consumer. No existing Secret was read during this work.
+
+The first live drill must retain email identifiers, alert occurrences, Bernd's
+explicit acknowledgment events, exact audit references and independent readback.
+Run a controlled failure and stopped-producer case, plus unauthorized account,
+expired login, scanner GET, duplicate click and audit-unavailable checks.
+Outside-node monitoring and recurring backups remain the existing T04 gates.
+
+## Verification
+
+```bash
+RTEL_AUDIT_CORE_SOURCE=/home/worsch/audit-core python3 -m unittest discover -s tests -v
+amtool template render --template.glob=templates/alert-email.tmpl \
+  --template.text='{{ template "railiance.alert.email" . }}'
+```
+
+The optional receiver test uses actual audit-core ingestion and SQLite with
+synthetic credentials: first accepted, lost reply, then duplicate after restart.
+It is not production custody proof. The template follows the upstream
+[notification data contract](https://prometheus.io/docs/alerting/latest/notifications/).
+The founder created `platform@coulomb.social`. The reviewed platform helper
+creates `platform/workloads/railiance-telemetry/smtp` without a password through
+attended OpenBao login. The founder then adds `SMTP_PASSWORD` as a new version,
+preserving existing public SMTP fields.
+Live activation remains blocked on password provisioning, dedicated credential custody,
+client/caller admission, runtime rollout and recipient/readback drills.
+No email or production acknowledgment is claimed.
+
+Runtime validation (hash-pinned dependencies in requirements-runtime.lock):
+
+```bash
+RTEL_FLEX_AUTH_BINARY=/tmp/rtel-flex-auth /tmp/rtel-ack-venv/bin/python -m unittest discover -s tests_runtime -v
+```
+
+The candidate workload, container recipe and runtime settings are owned by
+`rapp-telemetry/acknowledgment`. The policy source and exact client registration
+are in `integration/`; they are not active registrations.
diff --git a/history/2026-09-28-alert-acknowledgment.md b/history/2026-09-28-alert-acknowledgment.md
new file mode 100644
index 0000000..8f33be6
--- /dev/null
+++ b/history/2026-09-28-alert-acknowledgment.md
@@ -0,0 +1,45 @@
+# Email acknowledgment implementation — 2026-09-28
+
+Existing task RTEL-WP-0002-T04 holds this work; no task/workplan added.
+User decision f149e316-4ef4-4855-8453-bc9cdc938aad approves email to
+bernd.worsch@gmail.com, explicit receipt confirmation, Railiance admin role,
+audit-core evidence and controlled drills. Subsequent direction selected From
+platform@coulomb.social and confirmed the mailbox needs setup.
+
+Implemented WSGI acknowledgment, immutable first receipt, atomic SQLite audit
+outbox, bounded audit transport, OIDC code/PKCE sessions, native Flex Auth
+binding/digest/lifetime checks, Waitress runtime and background audit draining.
+GET is inert; POST requires verified human/platform/admin identity, a fresh PDP
+allow, Origin and CSRF. Email links identify occurrences, not bearer credentials.
+
+Validation: 33 core tests with actual audit-core 3e42ca8 ingestion, including
+accepted/lost-reply/reopened-store/duplicate; seven runtime tests with signed RSA
+issuer fixtures, complete browser flow and the actual Flex Auth evaluator.
+Synthetic identities/credentials do not prove production login or custody.
+Native Alertmanager 0.28.1 template render passed. Hash-pinned runtime container
+built; network-isolated read-only container returned HTTP 200 health and exited
+cleanly on SIGTERM. Package candidates reside in rapp-telemetry/acknowledgment.
+Policy and browser client registration candidates reside in integration/.
+
+Native changes: identity-provisioner verified tegwick's requested email and added
+only railiance-admins, preserving other memberships. KeyCape 1164f65 maps that
+explicit group to railiance-admin without granting platform-operator. Full Go
+suite passed. Published immutable image:
+sha256:6f79a2af1c695d39480173fad013facd84d21e7732860366af519302a2c496b8.
+NetKingdom manifest server dry-run passed; diff changed only the image (plus
+metadata). Deployment rolled out successfully. Signed role remains unverified
+until a real login. No Kubernetes Secret values were read or printed.
+
+Remaining gates: mailbox setup; scoped SMTP/webhook/audit custody and receiver
+registration; safe OIDC client registration and enforced policy caller admission;
+application rollout; native login and actual failure/absence emails, Bernd's
+acknowledgments and independent audit readback; outside-node watchdog and
+recurring backups. Existing owner client helpers read complete Kubernetes
+Secrets and cannot be used under the current environment orientation's rule.
+No live email or acknowledgment is claimed. Workplan stays blocked, T04 wait.
+
+Subsequently the founder created platform@coulomb.social and requested an OpenBao
+entry, with the password to be added by the founder as a new version. Platform
+helper scripts/telemetry_smtp_entry.py is silent, CAS=0, never reads credential
+values, and preserves any existing version. Four unit tests pass. Attended
+founder OIDC/MFA execution is requested; no native KV creation is yet claimed.
diff --git a/integration/fixtures.json b/integration/fixtures.json
new file mode 100644
index 0000000..f66a665
--- /dev/null
+++ b/integration/fixtures.json
@@ -0,0 +1,12 @@
+[
+  {
+    "id": "unknown-request-denied",
+    "request": {
+      "id": "unknown",
+      "subject": {"id": "unknown", "type": "human"},
+      "action": "acknowledge",
+      "resource": {"id": "alert:unknown", "type": "telemetry-alert", "system": "railiance-telemetry"}
+    },
+    "expect": {"effect": "deny"}
+  }
+]
diff --git a/integration/keycape-client.json b/integration/keycape-client.json
new file mode 100644
index 0000000..1eeaf35
--- /dev/null
+++ b/integration/keycape-client.json
@@ -0,0 +1,20 @@
+{
+  "clientId": "railiance-telemetry-admin",
+  "displayName": "Railiance Alert Acknowledgment",
+  "audience": "railiance-telemetry",
+  "redirectUris": [
+    "https://telemetry.coulomb.social/ack/auth/callback"
+  ],
+  "allowedScopes": [
+    "openid",
+    "profile",
+    "email",
+    "telemetry:read",
+    "telemetry:acknowledge"
+  ],
+  "grantTypes": [
+    "authorization_code"
+  ],
+  "clientType": "public",
+  "mfaRequired": true
+}
diff --git a/integration/railiance-admin-directory.py b/integration/railiance-admin-directory.py
new file mode 100644
index 0000000..bcb843f
--- /dev/null
+++ b/integration/railiance-admin-directory.py
@@ -0,0 +1,42 @@
+"""Run inside the existing identity-provisioner pod; never print credentials.
+
+Default is read-only. --apply adds only the approved user's named group.
+"""
+import json
+import os
+import sys
+from provisioner import LLDAPProvisioner
+
+
+def main():
+    apply = sys.argv[1:] == ['--apply']
+    if sys.argv[1:] not in ([], ['--apply']):
+        raise ValueError()
+    if os.environ['LLDAP_URL'] != 'http://lldap.sso.svc.cluster.local:17170':
+        raise ValueError()
+    client = LLDAPProvisioner(base_url=os.environ['LLDAP_URL'], admin_password=os.environ['LLDAP_ADMIN_PASSWORD'])
+    token = client._login()
+    user = client._user(token, 'tegwick')
+    if not user or user['id'] != 'tegwick' or user['email'].lower() != 'bernd.worsch@gmail.com':
+        raise ValueError()
+    before = {g['displayName'] for g in user['groups']}
+    if apply and 'railiance-admins' not in before:
+        groups = client._gql(token, 'query { groups { id displayName } }', {})['groups']
+        group = client._ensure_group(token, groups, 'railiance-admins')
+        client._add_group(token, 'tegwick', group)
+    after = {g['displayName'] for g in client._user(token, 'tegwick')['groups']}
+    if not before <= after or after - before - {'railiance-admins'}:
+        raise ValueError()
+    if apply and 'railiance-admins' not in after:
+        raise ValueError()
+    print(json.dumps({'mode': 'apply' if apply else 'inspect', 'directory_user': 'tegwick',
+        'email_matches_requested_recipient': True, 'group': 'railiance-admins',
+        'member': 'railiance-admins' in after, 'other_memberships_preserved': True,
+        'signed_role_claim_verified': False}))
+
+
+try:
+    main()
+except Exception:
+    print('{"status":"directory-operation-refused"}')
+    sys.exit(1)
diff --git a/integration/registry.json b/integration/registry.json
new file mode 100644
index 0000000..cde5eaa
--- /dev/null
+++ b/integration/registry.json
@@ -0,0 +1,11 @@
+{
+  "subjects": [{
+    "id": "uid=tegwick,ou=people,dc=netkingdom,dc=local",
+    "type": "Human",
+    "tenant": "tenant:platform",
+    "display_name": "Bernd Worsch",
+    "organization_relation": "ServiceProvider",
+    "roles": ["railiance-admin"]
+  }],
+  "resources": []
+}
diff --git a/integration/telemetry-policy.md b/integration/telemetry-policy.md
new file mode 100644
index 0000000..47de2df
--- /dev/null
+++ b/integration/telemetry-policy.md
@@ -0,0 +1,71 @@
+---
+id: railiance-telemetry.alert-acknowledgment
+name: Railiance admin alert receipt acknowledgment
+namespace: railiance-telemetry:telemetry-alert
+version: v1
+status: ready
+package: flexauth.railiance_telemetry.alert_acknowledgment
+allow_ttl: 30s
+actions: [read, acknowledge]
+owner: flex-auth
+fixtures: [fixtures.json]
+caring:
+  profile: caring-0.4.0-rc2
+  enforce: false
+activation:
+  mode: local
+---
+
+# Requested telemetry admin mandate
+
+Bernd Worsch authorized the named Railiance admin role and receipt actions on
+September 28 under RTEL-WP-0002-T04. Native service caller admission and directory
+membership remain required. This policy permits no alert silencing, resolution,
+configuration change or unrelated estate operation. The caller must validate
+the signed KeyCape session and supply its unchanged identity/assurance facts.
+
+```rego
+import rego.v1
+
+decision := {"effect": "allow", "reason": "railiance_admin_alert_receipt"} if {
+  input.tenant == "tenant:platform"
+  input.subject.type == "human"
+  input.subject.tenant == "tenant:platform"
+  is_string(input.subject.id)
+  input.subject.id != ""
+  input.subject.id == "uid=tegwick,ou=people,dc=netkingdom,dc=local"
+  "railiance-admin" in input.subject.attributes.roles
+  authentication := input.context.authentication
+  authentication.issuer == "https://kc.coulomb.social"
+  authentication.principal_type_source == "authentication-derived"
+  authentication.tenant_source == "directory-asserted"
+  "railiance-admin" in authentication.roles
+  "railiance-admins" in authentication.groups
+  assurance := authentication.assurance
+  assurance.level == "aal2"
+  assurance.mfa == true
+  assurance.source == "key-cape"
+  assurance.methods == ["pwd", "otp"]
+  is_number(assurance.at)
+  age := time.now_ns() / 1000000000 - assurance.at
+  age >= -30
+  age <= 900
+  input.resource.system == "railiance-telemetry"
+  input.resource.type == "telemetry-alert"
+  input.resource.tenant == "tenant:platform"
+  regex.match("^alert:[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$", input.resource.id)
+  input.action in {"read", "acknowledge"}
+} else := {"effect": "deny", "reason": "telemetry_identity_or_scope_refused"} if {
+  true
+}
+```
+
+```rego test
+package flexauth.railiance_telemetry.alert_acknowledgment_test
+import rego.v1
+import data.flexauth.railiance_telemetry.alert_acknowledgment
+
+test_unknown_request_denied if {
+  alert_acknowledgment.decision.effect == "deny" with input as {}
+}
+```
diff --git a/requirements-runtime.lock b/requirements-runtime.lock
new file mode 100644
index 0000000..a30c230
--- /dev/null
+++ b/requirements-runtime.lock
@@ -0,0 +1,164 @@
+# This file was autogenerated by uv via the following command:
+#    uv pip compile requirements-runtime.txt --generate-hashes -o requirements-runtime.lock
+cffi==2.1.1 \
+    --hash=sha256:046bfc24911b37851ee1b51aab8bffe713d89c68c6a057b09484ce9fd5f69b4e \
+    --hash=sha256:06c72bb76605a4b0cd0aad6930b69d4baf7dd5d806cfc409b824191099700e66 \
+    --hash=sha256:0beceaabe56af686895136a2de78db54ecd8e4046b236b8fd6d6cb61389e9bf2 \
+    --hash=sha256:154852545011f779917b11c78db2358d095da62a9a172b78ad0a583ee5adc0d0 \
+    --hash=sha256:194cffa889098ced9976c3fc6340305e43f6303657d298da55366907c05c22d6 \
+    --hash=sha256:19ee6127ee34de7d83ce3d371ebc5ed91addbdcc39f9ab15ce4eb35a4e534971 \
+    --hash=sha256:1a18a57b58cfb21fc28d72e876acf10eaed67a1ed96226f92af4df681d571c4c \
+    --hash=sha256:1aa5645c30469b09530c4ebca77ebf8f17618293c58f8549cb1a543a50236e7d \
+    --hash=sha256:1dea0e4d7d4f11f619fe8c1d76caf49e24405b4b5743c0e3be16a500ecd930c9 \
+    --hash=sha256:208f941bb9d18e768138677f0a6d2ce01f590df56043dda1df1535ac57c88517 \
+    --hash=sha256:210019b6c7cf07f081b4c54635c8cf744377001350e29cc0f81c4377b4797735 \
+    --hash=sha256:246fa40ce8645a614ff682e0b70f37134e460eaf93a775e0cbe3cca585a67a80 \
+    --hash=sha256:25792eac27877609e7bb06d42ff88278a6624fff2ba9bbb523c09616b117e80f \
+    --hash=sha256:27350daa11d4f10c540e6e89dada4c54feb7256ad03e9a4dc075ebad7ba360d1 \
+    --hash=sha256:28907ab9bfb6aa13184cfc17c6b8e1023c5ab6fd7076d8c20a35e59fe04f8f29 \
+    --hash=sha256:2ae64be792b8966f2c69538199728b290e34726562896df1e5dc8ffd8d8188e8 \
+    --hash=sha256:31348097ff5bbe827ccc41795d4dd099d9f0625e7def00ee653c137a490c2a6c \
+    --hash=sha256:3143d81e29e1e20a9ce10901ec369012947876596f75a222235965f2b7ae832e \
+    --hash=sha256:3222ba5d678f80a030e6afbcc33dc1ae5cb45facabb61cee2c7016b8432fde48 \
+    --hash=sha256:3311ed60d36f83378794e1009ac6258bafbf81f7888b4caa7b35a521e3f95813 \
+    --hash=sha256:334644fbac4eff73d985a17a91226df55d0f394160c4cfb880e084c8f7161cac \
+    --hash=sha256:34e261f78cb6ceaaa36f42f2613f4380d94d9c759a9c73c769ee6e0247364632 \
+    --hash=sha256:363e05fa78e15116c3c32c210ee36884fd6b9afa6d440e47112c3bd511d64cb6 \
+    --hash=sha256:398aff33cee2767e3e781d2554c54bd0dff386bb437581e0d8011fde1a942ec1 \
+    --hash=sha256:3d22a20b1fb1632cc72c22f95f7b0d2961c3e1c235f245ba4c606c4771035659 \
+    --hash=sha256:42a494cee34437f05546455144f2b5d9ac09b1face62bcfce597d2e521066688 \
+    --hash=sha256:42e2f76b9455f5a9a844f770bf3e200ed3da0e15f5df3db9c31fe80b04b3d004 \
+    --hash=sha256:42f6930c31dc7f50732c9ae793c2786c7b6b044195967bbdde40bb9be81c4cc0 \
+    --hash=sha256:456a61fa52d579ebf9df2e9552ead5129855dbaff6c1e5a9b1bc408809bdc062 \
+    --hash=sha256:471cee653ae88de62096552e6d24ccb4a5adb8c8c9f10b5054d0122c15bf2779 \
+    --hash=sha256:49cbc70e6542d4ccccb936558d1064a8012541e78f821f955cff24e357776c94 \
+    --hash=sha256:4a7c934f7360e8cd64fe9efadcbd10c7c6364f531e432b9a4bf5ccbc9e0e8b50 \
+    --hash=sha256:4be96343e422f2dfcd12ab5c9f5aebe03f82f737c6bffeca6830b3875cb44aab \
+    --hash=sha256:4f42141fc14250de6dde5ee7ea4432be017252d91f19c5ad043c084cea629cac \
+    --hash=sha256:507a24c282e0f42f8ed737cf048572cbf580468da5555764a8331735e9c736b6 \
+    --hash=sha256:51b31d1c98274844cfd7838ce00bfc27c7423a4dc00fc0772fc3331c2cc90676 \
+    --hash=sha256:58acb8ab8e295e6c5ea12f888cbb13cf21511ef2a3303a23f4325c29d17fe5c1 \
+    --hash=sha256:5a59cc1c4442bc3d5c703bf720b51138d0bfc173618807c9ee2490a7541dd3d9 \
+    --hash=sha256:5bb4e7ea95dcd6a014a6fef62e62467d67d8e582326443f3d68e71d6320a9fcf \
+    --hash=sha256:5c58fe613dc5e5336357eff555824a314d8e43282600435c8d1cb6a7a2fedd13 \
+    --hash=sha256:5e7cecbaadb83884793e05828cee59b210b24583b9c7425d0ba6a754fe22eb4e \
+    --hash=sha256:616f097f2fe415bc92a247f02e11f634e1f9e9a83d327e3c915c15089c87869e \
+    --hash=sha256:63bbfd5ded17c4840ac07cd8f1c21ba9d9708141f840b324f422f41b207e3973 \
+    --hash=sha256:64faea20f4e2613363a1a9b9c7dd73058f3ecd00133a511e72ad7c511658f527 \
+    --hash=sha256:661c298b4821edebead0c91edd2b00374d67ad7c5a1f7a91d4442633b79d6a72 \
+    --hash=sha256:68e62fe11f30d5ca8289242866f0a5291402d8529ca2178ab8afc5c9694ae890 \
+    --hash=sha256:6a8dddef476fab96d066d578fc88526767b836ab5ab21754e1d5bf3879c31c7c \
+    --hash=sha256:6e192623c49c94421616a5778fba35cf0d5a8d000650c1967ef4448ee5cdd990 \
+    --hash=sha256:7225e4514edb64eb6740324353e0da0711954fd8d7da4576755b1c6e09b697cd \
+    --hash=sha256:75f80557d1389eddbd0de2681f6a390a0c5338c31ddaa821381c203fc3fd50d9 \
+    --hash=sha256:770de9db11e84213beec501cfcaa013b019820ca881e03344dea5844f7876d94 \
+    --hash=sha256:7750c6449dff7864bb9bb27ddfb0267756189201a3afc911d82b3caacd70dfc3 \
+    --hash=sha256:7bde5e4cc5c10140859842b9d383af292b22639a4dffb725314baf45968cef80 \
+    --hash=sha256:7ce713ace7c0e4520535b42b77eaa742c16dab813978064913e5a3cf82973b41 \
+    --hash=sha256:7da0c5eff80f0197f3b3d1232ec5a682a9325f4ae9016a78f5f5ca35f9ced1f5 \
+    --hash=sha256:7dbb61fe3a7699468030f71bbe5f8a0e326a151daa91beb11a6fc1f980c55e1c \
+    --hash=sha256:811bd1e21d32de12efca32393a0ab3f5133b54fce9bd44b8bd77ab07da14bf6a \
+    --hash=sha256:8ef53b2de9bcb9197d31854256575d59dbac0cba72ac627bb291ef5eceb74be4 \
+    --hash=sha256:937c0052c05a31ca1daf18de3158eed4dbfcb9cc107adbea227728d647be701e \
+    --hash=sha256:9d2055050ea716bd38b7f7f1579c275386646b4894c155a3e2f3cd62ed41b7c6 \
+    --hash=sha256:9f8d177621de5cb38ee3e731eda45d421db093ec0739f46a5594babda7987a98 \
+    --hash=sha256:a2d7755bef5a12ed488f4ef1f1b69ee9191d7396083b755a5d2295f6edb4768b \
+    --hash=sha256:a48d62ab9d6f4f98c983223a547af44be6ca3691074c31cecced6facd3ba2dc1 \
+    --hash=sha256:a4f00aa42f75d6e4595e8866e748cc1705adc0cddfeb2ca86d0d03993d63ba03 \
+    --hash=sha256:a6e721d4b0e45d5b65e87534470e67b18dcd092c83f68fba09f152b9cbc061af \
+    --hash=sha256:a730a083190634c65cca36ba5f489531576ebd79bcd5c8e172130f6453127231 \
+    --hash=sha256:a931079504ecc49efed7744c476a5c343a92fabf66dec2db95edb1b2fdc770e2 \
+    --hash=sha256:aa9511c62d14da7aacc9b4bf51f3f697a621e83b2d6919008243c3aad168eea3 \
+    --hash=sha256:ab36d55f9ed2d067327667c2fea18dda018eb628dd6347aa01dda6cf1f5d3836 \
+    --hash=sha256:ad2c86c495b899d862ea0f4b42891b8713a3bd45dd4105c7fd51c2a72f39f3a5 \
+    --hash=sha256:aeae0e330c9f6acd681f647d46cefd30c29f93e3392882e792e82080c9691399 \
+    --hash=sha256:b0431303acaea1089ad4b3e9ce4e6518193def1118d4073ca848635ee4ea2e96 \
+    --hash=sha256:b5bdfd1c873d4e093aabc0ca84c4ca6dbc4f752afb5c86f146d9742580c9da2e \
+    --hash=sha256:baed1e86cc735622097354b9d1281406caf42ff42a886d29faa8e8d1630333be \
+    --hash=sha256:c1453022f490d2459a11819d83ad1d586e9ff65a12ac3e705ffebd46d3685dcf \
+    --hash=sha256:c26608d2222fb1e94487e4a387d85f13eb55d5ed725cb25a0c589ac4ee60e7bc \
+    --hash=sha256:c7659f22557c5a0bc4855cd635f55edec690cc008a40768527762cb9fb263455 \
+    --hash=sha256:c8c69575568085ba0b1b10c0249d779a214aea6f6522e949a0fc9fb0fcb449d0 \
+    --hash=sha256:c8d2c9fd1f2d16f780d15127abb050d13d1a76c03a4bd87d7e4980e45e511e12 \
+    --hash=sha256:ca82be1a1d406ecfe1d25dc16cb33488e5a16bf4438c9fb590484ea29d92478b \
+    --hash=sha256:cc572dace3f60ef98d7b12ff411d20f5362feb31a0439eab0085bbfd349982d7 \
+    --hash=sha256:d18e5ac0f2f03f4f518d3e23db0f0cad7faa1da8620e9c09461d443bbf6e6692 \
+    --hash=sha256:d28630f5854ab07ab1fd4aba756de52326c82e6be15d414b12793f1975048b54 \
+    --hash=sha256:d9c275eaacd24aa73f94ffd6de08fc3f932424d8b6c376f4bed7cde376fe7bc3 \
+    --hash=sha256:da0e573f9f97159390c89d9f1a9e41908b66d408cc5b58d08cf3847d844c531b \
+    --hash=sha256:dd31f52ea1086513bb9df30f8fcee9b8918323ae067a3d5b78bc826a000712be \
+    --hash=sha256:dddad92b554513a31f272570678ba307fb9f618f05e3d4a5eacafff9eae03e1d \
+    --hash=sha256:df423d40ee8654634421812bc3b196da3f9bd7d32929da813f8394c4348a5358 \
+    --hash=sha256:df913725b79db7bcf03448f36b7bf8815363417d5b58deecf9305e3e30f0f21a \
+    --hash=sha256:e0bcb7e0f677f543555d2adff3bf19c05f66cdb4796e5ff602442ab2fe3c4ef7 \
+    --hash=sha256:e2d65b31f36619cda3999b78b2aa9632e76b78448e7a56fc4240824200e7c4fc \
+    --hash=sha256:e6e8cff14d6fb0be70a09c0bdc58096f501952d04624ebf867e0e56da2df8960 \
+    --hash=sha256:f16c709686a78c727bbbf059f92b0bf41c6fc60deec706d2dc19f529175a6125 \
+    --hash=sha256:f24fb43132a4c6b4cb4eb029492919b2db645be6808d738f244fd146c03c32cb \
+    --hash=sha256:f53e442b08449d42821fa4a4fba000095af9f62742a500f978a9f557ec44339a \
+    --hash=sha256:f5cfbc5fe74540d335175b656c725d74d90e3730c626d92575eea35029d9afaa \
+    --hash=sha256:f81b3b8f3d4e343550fa4baa0e479bba9f2d29ce9c2e9b51d1ce1718d7442fcf \
+    --hash=sha256:f8ec5e643a9a937f64e1999eb9f75d072263751912dc5cd06d3c85f8f44be7c3 \
+    --hash=sha256:fb92203a88b3d3053034db775110081c49d28be6551923805e039924093761e4 \
+    --hash=sha256:fcd22650c908d7b7da162bbfaab594a1227a15d1643a98c68b122ac642fa2264
+    # via cryptography
+cryptography==50.0.1 \
+    --hash=sha256:01f41478cf33fc605a6a089cd56d28b45c6c0b45a1928b61797f2621a04bac71 \
+    --hash=sha256:05ba322c4da95b262a212c345af888ef2c37c88c0509756ea00a0e6d68850f23 \
+    --hash=sha256:16c5ecd954b3330ebfb6605eca4fd952da8bef376551d5cc264534e3770a9ee6 \
+    --hash=sha256:2a93d05e34d5f67fba6f891fe85d929999baa7195e853923ea6d7576c9e68c5e \
+    --hash=sha256:2b34d76a652ea2b6faf777c35df230c5637842cd904e04f16230c3f9f03e4361 \
+    --hash=sha256:2ebbfb0f1fed745e91796e3e1080a1440423fdae8ece1b995a1d80883a409054 \
+    --hash=sha256:30a125032e5642a21ff816e021152bd4e7e94f03eff3f4b7fca41cd22bc3110f \
+    --hash=sha256:330fbb252391c596f1ae42c5754449dc924e6ad012dca8efe0d703f9f2d12ec6 \
+    --hash=sha256:359e62deae718bce96170e223fdcb6357e4fbd3bb7a3a75f4430763532560e49 \
+    --hash=sha256:407fe2b6db00939c05c0e945e9914238f2f0a430974839429dafc82b1ee6bee5 \
+    --hash=sha256:42be3bb70596b3abe4ac097b75be223e8b3ab614a0e5de068e3dcc54d71d6149 \
+    --hash=sha256:4c4188f7c0cf655be5c06342b817ed0f9595b69ffa2b12026e5353eed29dea88 \
+    --hash=sha256:51593d180cf6d179bde5c5d065bed81386b1f381656ae7d042b7ffc87a9895ad \
+    --hash=sha256:51afcfceb15597cf2635068e4ac9a56b2abde622edde17f37d85fd7b5306497a \
+    --hash=sha256:53e279950892dc102c6b4e52af03ae5ea92fac572a1ddab78ca73a997f62b69f \
+    --hash=sha256:55d16b1ef3ee0958d893a977b19777887e546c9954ea81b200c3301a864013f2 \
+    --hash=sha256:5dd9bda1c12b4162f6ff568eeb5e0ff956c28d14406e875cfe8a63a2d414ff20 \
+    --hash=sha256:5fe002589592ed749ce77fe0695fcbd3500dd61d7d6db5858a7544c612fa8e45 \
+    --hash=sha256:5fe939deeb161024a6be98229c953b6591fef1f41214497a78fe793a244c017f \
+    --hash=sha256:693c99b49bd37d0d096e4334c10232c77248c415b98d35236094cdf96d57258b \
+    --hash=sha256:76de83fbd91ac49c0feaaa983d0748fd7a53176afac5fb3bf7478d244f0eb527 \
+    --hash=sha256:79bf008d1f9af6071c797ad133e39915dfee7614f18f18f4db9072eb715064a3 \
+    --hash=sha256:804728ce710890870f3aaa344b2e161172d258d768ac139d02cfd9092d0d94e6 \
+    --hash=sha256:8921d58f426793c5f1b47f0b59575780de9a095214958d0eb37d909593db8367 \
+    --hash=sha256:8df2de9102026855887e4587084f6eabd80ed0f345b8ad8a7ac27ab9bf4723e0 \
+    --hash=sha256:9cb3cb952cf5a8abd50c782a98a89d71699715e802fe349704b47f2425b42a94 \
+    --hash=sha256:9dde0a357190eb3b1da1bb9ab750e9c85cba82ca5977aa0836cbb94e92611239 \
+    --hash=sha256:9ebcdd5519be9b652a46f507817a74591774fc3d6923ac364e4dfa64e36b291b \
+    --hash=sha256:a0b1a59e3a089064a0ec309e9428c8e3ae4e161419d20ac33600767e83fc658a \
+    --hash=sha256:a255449073358275b64b67d3f595f268bbef70e72b6edb65e0c70c735bf739c9 \
+    --hash=sha256:a8f40ea47330e71b594a7e246898f93177c259490c63183dbaf9e571d71ed9a5 \
+    --hash=sha256:ac02b07824d4d1001bd4367599f839c19cb171924c796e52c23508ac14c2c0cc \
+    --hash=sha256:aed8db4f6d71c51efb89530e12d9464e7bf2923d46c3205dc794a2a93f8c0648 \
+    --hash=sha256:b8f852c65863251b9e3a1b8c150ce21e59b522dbb6a7d4bc80e680d38388e986 \
+    --hash=sha256:be224a65493ec5b74a158ff22a5522ce4a5ca1e543c647a3a4730d4a09e5f959 \
+    --hash=sha256:ca83d00d9e69cd5eb63f2e69c3a5a59e0cecae5ae14c6ae0b35830fe3b37bad0 \
+    --hash=sha256:cbf74a81765ee67413503ca6e26dcc4f6f5a519822436cc0a1b97aab6c1b8a17 \
+    --hash=sha256:d63ae8f6481fec907ac0f588eee8a90aefde112c633131fe540e5711ddbb5a4e \
+    --hash=sha256:e22dfed744bd4002e909464cb23d2f0b05c6f3113a79ef2e9864a53db737c733 \
+    --hash=sha256:e2ca8fd1b6b4b82a1c4cb02841d0837e3c12336c2e24b520ab8ab3b969733d8f \
+    --hash=sha256:e74591e283fe6eb956416c929eb58262a719fe0311fd9054c62c3350ed8760d8 \
+    --hash=sha256:f74455bb086a85d5e81246412602aaa97ed095e504cd40dd261ef50be42205bf \
+    --hash=sha256:fb4b9672d389c738b175c4166e78310f8a70358886aacd9173ee03a85ffdc671 \
+    --hash=sha256:fc3ed7ebd2a8c96f5b166de0ab9b624996bef3b07bbeb19364dfb78222c22c80 \
+    --hash=sha256:fd3718b960d0b5dd213cdf03f3bcb7000e69dda0de8b956061947ff6bcff5558 \
+    --hash=sha256:ff838d62ec1bfce4f9ba7fa16f4a7b554cd8d0c299e6be37502161a660c84eef
+    # via pyjwt
+pycparser==3.0 \
+    --hash=sha256:600f49d217304a5902ac3c37e1281c9fe94e4d0489de643a9504c5cdfdfc6b29 \
+    --hash=sha256:b727414169a36b7d524c1c3e31839a521725078d7b2ff038656844266160a992
+    # via cffi
+pyjwt==2.15.0 \
+    --hash=sha256:7a3742debf6b879e912dbb9819ceec1594be812452b78c5f2e2dfc56564954f8 \
+    --hash=sha256:b11c5f9791d7bf51c2b39a81ed669f6b2dbbd669df2942f6c60167e9e3d1abe4
+    # via -r requirements-runtime.txt
+waitress==3.0.2 \
+    --hash=sha256:682aaaf2af0c44ada4abfb70ded36393f0e307f4ab9456a215ce0020baefc31f \
+    --hash=sha256:c56d67fd6e87c2ee598b76abdd4e96cfad1f24cacdea5078d382b1f9d7b5ed2e
+    # via -r requirements-runtime.txt
diff --git a/requirements-runtime.txt b/requirements-runtime.txt
new file mode 100644
index 0000000..b9415d1
--- /dev/null
+++ b/requirements-runtime.txt
@@ -0,0 +1,2 @@
+PyJWT[crypto]>=2.10,<3
+waitress>=3,<4
diff --git a/scripts/alert_ack.py b/scripts/alert_ack.py
new file mode 100644
index 0000000..78b6b53
--- /dev/null
+++ b/scripts/alert_ack.py
@@ -0,0 +1,307 @@
+"""Durable alert acknowledgments behind owner-supplied identity and PDP adapters.
+
+This module deliberately has no network entrypoint or trusted-header fallback.
+The package must bind verified browser sessions and fresh authorization decisions.
+"""
+from dataclasses import dataclass, field
+from contextlib import contextmanager
+from datetime import datetime, timezone
+import hashlib
+import html
+import hmac
+import json
+import os
+from pathlib import Path
+import re
+import sqlite3
+import stat
+import time
+from urllib.parse import parse_qs, urlencode
+import uuid
+
+from receiver import instant, strict_json
+
+ROLE = 'railiance-admin'
+TENANT = 'tenant:platform'
+SOURCE = 'railiance-telemetry'
+
+
+def encoded(value):
+    return json.dumps(value, sort_keys=True, separators=(',', ':'), allow_nan=False)
+
+
+def occurrence(fingerprint, starts_at):
+    if not isinstance(fingerprint, str) or not re.fullmatch('[0-9a-f]{16}', fingerprint):
+        raise ValueError('invalid fingerprint')
+    # Preserve nanosecond precision in the wire timestamp; Python datetime only
+    # keeps microseconds. Alertmanager template and webhook use the same format.
+    if not isinstance(starts_at, str) or len(starts_at) > 40:
+        raise ValueError('invalid start time')
+    instant(starts_at)
+    return str(uuid.uuid5(uuid.NAMESPACE_URL, SOURCE + ':' + fingerprint + ':' + starts_at))
+
+
+@dataclass(frozen=True)
+class Actor:
+    """Only constructed by the package's verified server-side session adapter."""
+    issuer: str
+    subject: str
+    tenant: str
+    roles: tuple
+    expires_at: float
+    csrf: str
+    principal_type: str = 'human'
+    assurance: dict = field(default_factory=dict)
+    groups: tuple = ()
+    tenant_source: str = ''
+
+
+class Store:
+    def __init__(self, path):
+        path = Path(path)
+        parent = path.parent.lstat()
+        if (not stat.S_ISDIR(parent.st_mode) or parent.st_uid != os.getuid()
+                or parent.st_mode & 0o077):
+            raise ValueError('private owned state directory required')
+        fd = os.open(path, os.O_CREAT | os.O_RDWR | os.O_NOFOLLOW, 0o600)
+        try:
+            info = os.fstat(fd)
+            if (not stat.S_ISREG(info.st_mode) or info.st_uid != os.getuid()
+                    or info.st_nlink != 1 or info.st_mode & 0o077):
+                raise ValueError('private owned database required')
+        finally:
+            os.close(fd)
+        self.path = str(path)
+        with self.connect() as db:
+            db.executescript('''
+                CREATE TABLE IF NOT EXISTS alerts (
+                    id TEXT PRIMARY KEY, fingerprint TEXT NOT NULL,
+                    starts_at TEXT NOT NULL, alertname TEXT NOT NULL,
+                    labels_digest TEXT NOT NULL, received_at TEXT NOT NULL);
+                CREATE TABLE IF NOT EXISTS acknowledgments (
+                    alert_id TEXT PRIMARY KEY REFERENCES alerts(id),
+                    event_id TEXT UNIQUE NOT NULL, issuer TEXT NOT NULL,
+                    subject TEXT NOT NULL, occurred_at TEXT NOT NULL,
+                    decision_id TEXT NOT NULL);
+                CREATE TABLE IF NOT EXISTS outbox (
+                    event_id TEXT PRIMARY KEY, body TEXT NOT NULL,
+                    reference TEXT, status TEXT NOT NULL DEFAULT 'pending');
+                CREATE TRIGGER IF NOT EXISTS ack_immutable_update
+                    BEFORE UPDATE ON acknowledgments BEGIN
+                    SELECT RAISE(ABORT, 'immutable acknowledgment'); END;
+                CREATE TRIGGER IF NOT EXISTS ack_immutable_delete
+                    BEFORE DELETE ON acknowledgments BEGIN
+                    SELECT RAISE(ABORT, 'immutable acknowledgment'); END;
+                CREATE TRIGGER IF NOT EXISTS outbox_body_immutable
+                    BEFORE UPDATE OF body, event_id ON outbox BEGIN
+                    SELECT RAISE(ABORT, 'immutable audit event'); END;
+                CREATE TRIGGER IF NOT EXISTS outbox_immutable_delete
+                    BEFORE DELETE ON outbox BEGIN
+                    SELECT RAISE(ABORT, 'immutable audit event'); END;
+                CREATE TRIGGER IF NOT EXISTS alert_immutable_update
+                    BEFORE UPDATE ON alerts BEGIN
+                    SELECT RAISE(ABORT, 'immutable alert'); END;
+                CREATE TRIGGER IF NOT EXISTS alert_immutable_delete
+                    BEFORE DELETE ON alerts BEGIN
+                    SELECT RAISE(ABORT, 'immutable alert'); END;
+            ''')
+
+    @contextmanager
+    def connect(self):
+        db = sqlite3.connect(self.path, timeout=10)
+        db.row_factory = sqlite3.Row
+        db.execute('PRAGMA foreign_keys=ON')
+        db.execute('PRAGMA synchronous=FULL')
+        try:
+            with db:
+                yield db
+        finally:
+            db.close()
+
+    def receive(self, payload, now):
+        if (payload.get('version') != '4' or payload.get('receiver') != 'railiance-admin-email'
+                or payload.get('truncatedAlerts', 0) != 0
+                or not isinstance(payload.get('alerts'), list)
+                or not 1 <= len(payload['alerts']) <= 100):
+            raise ValueError('invalid webhook')
+        rows = []
+        for alert in payload['alerts']:
+            labels = alert['labels']
+            if (alert['status'] not in ('firing', 'resolved') or not isinstance(labels, dict)
+                    or not 1 <= len(labels) <= 32
+                    or not all(isinstance(k, str) and isinstance(v, str)
+                               and len(k) <= 100 and len(v) <= 256 for k, v in labels.items())
+                    or not re.fullmatch('[A-Za-z_:][A-Za-z0-9_:]{0,99}', labels.get('alertname', ''))
+                    or labels.get('owner') != SOURCE):
+                raise ValueError('invalid alert scope')
+            identity = occurrence(alert['fingerprint'], alert['startsAt'])
+            if instant(alert['startsAt']).timestamp() > now:
+                raise ValueError('future alert')
+            digest = hashlib.sha256(encoded(labels).encode()).hexdigest()
+            rows.append((identity, alert['fingerprint'], alert['startsAt'], labels['alertname'],
+                         digest, datetime.fromtimestamp(now, timezone.utc).isoformat()))
+        with self.connect() as db:
+            db.execute('BEGIN IMMEDIATE')
+            for row in rows:
+                old = db.execute('SELECT labels_digest FROM alerts WHERE id=?', (row[0],)).fetchone()
+                if old and old['labels_digest'] != row[4]:
+                    raise ValueError('alert identity collision')
+                db.execute('INSERT OR IGNORE INTO alerts VALUES (?,?,?,?,?,?)', row)
+        return [r[0] for r in rows]
+
+    def get(self, identity):
+        with self.connect() as db:
+            row = db.execute('''SELECT a.*, k.subject, k.occurred_at, o.reference,
+                o.status AS audit_status FROM alerts a
+                LEFT JOIN acknowledgments k ON a.id=k.alert_id
+                LEFT JOIN outbox o ON k.event_id=o.event_id WHERE a.id=?''', (identity,)).fetchone()
+            return dict(row) if row else None
+
+    def acknowledge(self, identity, actor, decision_id, now):
+        event_id = str(uuid.uuid4())
+        at = datetime.fromtimestamp(now, timezone.utc).isoformat()
+        with self.connect() as db:
+            db.execute('BEGIN IMMEDIATE')
+            alert = db.execute('SELECT * FROM alerts WHERE id=?', (identity,)).fetchone()
+            if alert is None:
+                raise ValueError('unknown alert')
+            old = db.execute('SELECT event_id FROM acknowledgments WHERE alert_id=?', (identity,)).fetchone()
+            if old:
+                return old['event_id']
+            event = dict(id=event_id, type='telemetry.alert.acknowledged', source=SOURCE,
+                         subject='alert:' + identity, tenant=TENANT, correlation_id=identity,
+                         occurred_at=at, data=dict(actor_issuer=actor.issuer,
+                         actor_subject=actor.subject, role=ROLE, decision_id=decision_id,
+                         fingerprint=alert['fingerprint'], starts_at=alert['starts_at'],
+                         alertname=alert['alertname'], labels_sha256=alert['labels_digest'],
+                         meaning='receipt acknowledged; not resolved or silenced'))
+            db.execute('INSERT INTO acknowledgments VALUES (?,?,?,?,?,?)',
+                       (identity, event_id, actor.issuer, actor.subject, at, decision_id))
+            db.execute('INSERT INTO outbox(event_id,body) VALUES (?,?)', (event_id, encoded(event)))
+        return event_id
+
+    def drain(self, send):
+        """send(event) returns (HTTP status, decoded body); transport owns custody.
+
+        Concurrent drains may replay identical events. The receiver's idempotency
+        contract makes that safe. No success without the exact receiver reference.
+        """
+        with self.connect() as db:
+            rows = db.execute("SELECT event_id,body FROM outbox WHERE status='pending' LIMIT 20").fetchall()
+        for row in rows:
+            try:
+                status, body = send(json.loads(row['body']))
+            except (OSError, TimeoutError):
+                continue
+            if not isinstance(body, dict):
+                continue
+            accepted = (status, body.get('status')) in ((202, 'accepted'), (200, 'duplicate'))
+            reference = 'audit:' + row['event_id']
+            with self.connect() as db:
+                if accepted and body.get('reference') == reference:
+                    db.execute("UPDATE outbox SET status='delivered',reference=? WHERE event_id=?", (reference, row['event_id']))
+                elif status in (400, 401, 403, 409, 422):
+                    db.execute("UPDATE outbox SET status='blocked' WHERE event_id=? AND status='pending'", (row['event_id'],))
+
+    def requeue(self, event_id):
+        """Explicit maintenance after fixing a receiver refusal; preserve bytes."""
+        with self.connect() as db:
+            return db.execute("UPDATE outbox SET status='pending' WHERE event_id=? AND status='blocked'",
+                              (event_id,)).rowcount == 1
+
+    def audit_debt(self):
+        with self.connect() as db:
+            return {row['status']: row['n'] for row in db.execute(
+                "SELECT status,COUNT(*) AS n FROM outbox WHERE status!='delivered' GROUP BY status")}
+
+
+class Application:
+    """WSGI adapter. authenticate and authorize are required, never default-allow.
+
+    authenticate(environ) returns a verified Actor or None. authorize(actor,
+    action, resource) returns a fresh, binding-checked PDP decision receipt with
+    effect/id/expires_at; the package adapter must validate the native envelope.
+    """
+    def __init__(self, store, origin, webhook_token, authenticate, authorize, clock=time.time):
+        from urllib.parse import urlsplit
+        parsed = urlsplit(origin)
+        if (parsed.scheme != 'https' or not parsed.hostname or parsed.path
+                or parsed.query or parsed.fragment or parsed.username or parsed.password):
+            raise ValueError('fixed HTTPS origin required')
+        if not isinstance(webhook_token, str) or len(webhook_token) < 32:
+            raise ValueError('dedicated webhook credential required')
+        if not callable(authenticate) or not callable(authorize):
+            raise ValueError('identity and policy adapters required')
+        self.store, self.origin, self.webhook_token = store, origin, webhook_token
+        self.authenticate, self.authorize, self.clock = authenticate, authorize, clock
+
+    def __call__(self, env, start):
+        def respond(code, body):
+            headers = [('Content-Type', 'text/html; charset=utf-8'), ('Cache-Control', 'no-store'),
+                       ('Content-Security-Policy', "default-src 'none'; form-action 'self'; frame-ancestors 'none'"),
+                       ('X-Content-Type-Options', 'nosniff'), ('Referrer-Policy', 'same-origin')]
+            start(code, headers)
+            return [body.encode()]
+        try:
+            method, path = env.get('REQUEST_METHOD'), env.get('PATH_INFO')
+            if path == '/webhook' and method == 'POST':
+                if not hmac.compare_digest(env.get('HTTP_AUTHORIZATION', ''), 'Bearer ' + self.webhook_token):
+                    return respond('401 Unauthorized', 'Authentication required.')
+                raw = self.body(env)
+                self.store.receive(strict_json(raw), self.clock())
+                return respond('200 OK', 'Recorded.')
+            if path != '/ack/alerts' or method not in ('GET', 'POST'):
+                return respond('404 Not Found', 'Not found.')
+            actor = self.authenticate(env)
+            now = self.clock()
+            if (not isinstance(actor, Actor) or actor.expires_at <= now
+                    or not actor.issuer or not actor.subject or len(actor.csrf) < 32):
+                return respond('401 Unauthorized', 'Sign in through the admitted identity provider.')
+            if actor.tenant != TENANT or actor.principal_type != 'human' or ROLE not in actor.roles:
+                return respond('403 Forbidden', 'Railiance admin role required.')
+            params = parse_qs(env.get('QUERY_STRING', ''), strict_parsing=True, max_num_fields=2)
+            if set(params) != {'fingerprint', 'starts_at'} or any(len(v) != 1 for v in params.values()):
+                raise ValueError('invalid link')
+            identity = occurrence(params['fingerprint'][0], params['starts_at'][0])
+            decision = self.authorize(actor, 'acknowledge' if method == 'POST' else 'read', 'alert:' + identity)
+            if (decision.get('effect') != 'allow' or not decision.get('id')
+                    or decision.get('expires_at', 0) <= self.clock()):
+                return respond('403 Forbidden', 'Permission unavailable or refused.')
+            alert = self.store.get(identity)
+            if alert is None:
+                return respond('404 Not Found', 'Alert not received yet. Retry shortly.')
+            if method == 'POST':
+                if env.get('HTTP_ORIGIN') != self.origin:
+                    return respond('403 Forbidden', 'Invalid origin.')
+                form = parse_qs(self.body(env).decode(), strict_parsing=True, max_num_fields=1)
+                if (set(form) != {'csrf'} or len(form['csrf']) != 1
+                        or not hmac.compare_digest(form['csrf'][0], actor.csrf)):
+                    return respond('403 Forbidden', 'Invalid confirmation.')
+                if actor.expires_at <= self.clock() or decision['expires_at'] <= self.clock():
+                    return respond('403 Forbidden', 'Session or permission expired.')
+                self.store.acknowledge(identity, actor, decision['id'], self.clock())
+                alert = self.store.get(identity)
+            title = html.escape(alert['alertname'])
+            if alert['occurred_at']:
+                status = 'Audit record archived.' if alert['audit_status'] == 'delivered' else 'Audit delivery pending.'
+                return respond('200 OK', f'<h1>Receipt acknowledged</h1><p>{title}</p><p>{status}</p><p>This does not resolve or silence the alert.</p>')
+            query = html.escape(urlencode({k: v[0] for k, v in params.items()}), quote=True)
+            csrf = html.escape(actor.csrf, quote=True)
+            return respond('200 OK', f'<h1>{title}</h1><p>Started {html.escape(alert["starts_at"])}</p>'
+                           '<p>Confirm that you received this alert. This does not resolve or silence it.</p>'
+                           f'<form method="post" action="/ack/alerts?{query}"><input type="hidden" name="csrf" value="{csrf}">'
+                           '<button type="submit">Acknowledge receipt</button></form>')
+        except (ValueError, KeyError, TypeError, AttributeError, UnicodeError):
+            return respond('400 Bad Request', 'Invalid request.')
+        except (OSError, sqlite3.Error):
+            return respond('503 Service Unavailable', 'Service unavailable. Retry later.')
+
+    @staticmethod
+    def body(env):
+        length = int(env.get('CONTENT_LENGTH', '0'))
+        if not 0 < length <= 32768:
+            raise ValueError('body size')
+        raw = env['wsgi.input'].read(length)
+        if len(raw) != length:
+            raise ValueError('incomplete body')
+        return raw
diff --git a/scripts/alert_audit.py b/scripts/alert_audit.py
new file mode 100644
index 0000000..b9925d2
--- /dev/null
+++ b/scripts/alert_audit.py
@@ -0,0 +1,48 @@
+"""Bounded Audit Core transport for the acknowledgment outbox."""
+import json
+from urllib.error import HTTPError, URLError
+from urllib.parse import urlsplit
+from urllib.request import Request, HTTPRedirectHandler, ProxyHandler, build_opener
+
+
+class NoRedirect(HTTPRedirectHandler):
+    def redirect_request(self, req, fp, code, msg, headers, newurl):
+        return None
+
+
+class AuditTransport:
+    def __init__(self, origin, token_provider, *, allow_internal_http=False):
+        parsed = urlsplit(origin)
+        internal = parsed.hostname in ('127.0.0.1', '::1') or (parsed.hostname or '').endswith(('.svc', '.svc.cluster.local'))
+        if (parsed.scheme != 'https' and not (allow_internal_http and internal and parsed.scheme == 'http')
+                or not parsed.hostname or parsed.path or parsed.query or parsed.fragment
+                or parsed.username or parsed.password):
+            raise ValueError('fixed audit origin required')
+        self.url = origin + '/v1/events'
+        self.token_provider = token_provider
+        self.opener = build_opener(ProxyHandler({}), NoRedirect())
+
+    def __call__(self, event):
+        token = self.token_provider()
+        if (not isinstance(token, str) or not 1 <= len(token) <= 32768
+                or any(ord(c) < 33 or ord(c) > 126 for c in token)):
+            raise OSError('audit credential unavailable')
+        request = Request(self.url, data=json.dumps(event, sort_keys=True, separators=(',', ':')).encode(),
+                          headers={'Content-Type': 'application/json', 'Authorization': 'Bearer ' + token,
+                                   'Idempotency-Key': event['id']}, method='POST')
+        try:
+            with self.opener.open(request, timeout=5) as response:
+                raw = response.read(65537)
+                if len(raw) > 65536:
+                    raise OSError('audit response invalid')
+                body = json.loads(raw)
+                if not isinstance(body, dict):
+                    raise ValueError()
+                return response.status, body
+        except HTTPError as error:
+            # Keep no upstream diagnostic body, URL, credential or response text.
+            status = error.code
+            error.close()
+            return status, {}
+        except (URLError, ValueError, UnicodeError):
+            raise OSError('audit unavailable or invalid response') from None
diff --git a/scripts/alert_identity.py b/scripts/alert_identity.py
new file mode 100644
index 0000000..a50b3cc
--- /dev/null
+++ b/scripts/alert_identity.py
@@ -0,0 +1,136 @@
+"""KeyCape OIDC code/PKCE sessions for the telemetry acknowledgment surface."""
+import base64
+import hashlib
+import secrets
+import threading
+import time
+from urllib.parse import urlencode, urlsplit
+
+import jwt
+
+from alert_ack import Actor, TENANT
+from telemetry_http import Transport, origin
+
+SCOPES = ('openid', 'profile', 'email', 'telemetry:read', 'telemetry:acknowledge')
+
+
+class Login:
+    def __init__(self, issuer, public_origin, *, transport=None, clock=time.time):
+        self.issuer = origin(issuer)
+        self.public_origin = origin(public_origin)
+        self.callback = public_origin + '/ack/auth/callback'
+        self.client = 'railiance-telemetry-admin'
+        self.transport = transport or Transport()
+        self.clock = clock
+        self.lock = threading.RLock()
+        self.pending, self.sessions = {}, {}
+
+    def prune(self):
+        now = self.clock()
+        self.pending = {k: v for k, v in self.pending.items() if v['expires'] > now}
+        self.sessions = {k: v for k, v in self.sessions.items() if v.expires_at > now}
+
+    def metadata(self):
+        status, data = self.transport.request('GET', self.issuer + '/.well-known/openid-configuration')
+        if status != 200 or data.get('issuer') != self.issuer:
+            raise ValueError('issuer unavailable')
+        for key in ('authorization_endpoint', 'token_endpoint', 'jwks_uri'):
+            p = urlsplit(data[key])
+            if p.scheme + '://' + p.netloc != self.issuer or p.query or p.fragment or not p.path:
+                raise ValueError('issuer endpoint refused')
+        if 'S256' not in data.get('code_challenge_methods_supported', []):
+            raise ValueError('PKCE unavailable')
+        return data
+
+    def start(self, return_to):
+        parsed = urlsplit(return_to)
+        if parsed.scheme or parsed.netloc or parsed.fragment or parsed.path != '/ack/alerts' or len(return_to) > 1024:
+            raise ValueError('invalid return path')
+        metadata = self.metadata()
+        state, browser, nonce, verifier = (secrets.token_urlsafe(32) for _ in range(4))
+        with self.lock:
+            self.prune()
+            if len(self.pending) >= 1024:
+                raise ValueError('login capacity')
+            self.pending[state] = dict(browser=browser, nonce=nonce, verifier=verifier,
+                                       expires=self.clock() + 300, return_to=return_to, metadata=metadata)
+        challenge = base64.urlsafe_b64encode(hashlib.sha256(verifier.encode()).digest()).rstrip(b'=').decode()
+        return metadata['authorization_endpoint'] + '?' + urlencode(dict(response_type='code',
+            client_id=self.client, redirect_uri=self.callback, scope=' '.join(SCOPES),
+            state=state, nonce=nonce, code_challenge=challenge, code_challenge_method='S256')), browser
+
+    def decode(self, token, audience, keys):
+        if not isinstance(token, str) or not 1 <= len(token) <= 32768:
+            raise ValueError('invalid token')
+        header = jwt.get_unverified_header(token)
+        if header.get('alg') != 'RS256' or not header.get('kid'):
+            raise ValueError('invalid signing key')
+        matches = [key for key in keys if key.get('kid') == header['kid'] and key.get('kty') == 'RSA'
+                   and key.get('use', 'sig') == 'sig' and key.get('alg', 'RS256') == 'RS256']
+        if len(matches) != 1:
+            raise ValueError('invalid signing key')
+        claims = jwt.decode(token, jwt.PyJWK.from_dict(matches[0]).key, algorithms=['RS256'],
+                            issuer=self.issuer, audience=audience, options={
+                                'require': ['iss', 'aud', 'sub', 'iat', 'exp'], 'strict_aud': True})
+        if (not isinstance(claims['sub'], str) or not claims['sub']
+                or type(claims['exp']) is not int or type(claims['iat']) is not int
+                or claims['exp'] <= self.clock() or claims['exp'] <= claims['iat']):
+            raise ValueError('invalid claims')
+        return claims
+
+    def finish(self, state, browser, code):
+        with self.lock:
+            self.prune()
+            pending = self.pending.pop(state, None)
+        if not pending or not browser or not secrets.compare_digest(browser, pending['browser']) or not 1 <= len(code) <= 4096:
+            raise ValueError('invalid login state')
+        try:
+            status, tokens = self.transport.request('POST', pending['metadata']['token_endpoint'],
+                urlencode(dict(grant_type='authorization_code', client_id=self.client,
+                               redirect_uri=self.callback, code=code, code_verifier=pending['verifier'])).encode(),
+                {'Content-Type': 'application/x-www-form-urlencoded'})
+            if status != 200:
+                raise ValueError('code exchange failed')
+            status, jwks = self.transport.request('GET', pending['metadata']['jwks_uri'])
+            if status != 200 or not isinstance(jwks.get('keys'), list):
+                raise ValueError('issuer keys unavailable')
+            identity = self.decode(tokens['id_token'], self.client, jwks['keys'])
+            access = self.decode(tokens['access_token'], 'railiance-telemetry', jwks['keys'])
+            if identity.get('nonce') != pending['nonce']:
+                raise ValueError('nonce mismatch')
+            for key in ('sub', 'tenant', 'tenant_source', 'principal_type', 'roles', 'groups', 'assurance'):
+                if key not in identity or identity[key] != access.get(key):
+                    raise ValueError('paired identity mismatch')
+            if (access['tenant'] != TENANT or access['principal_type'] != 'human'
+                    or access['tenant_source'] not in ('directory', 'registration')
+                    or set(access.get('scope', '').split()) != set(SCOPES)):
+                raise ValueError('human platform scope required')
+            for key in ('roles', 'groups'):
+                if not isinstance(access[key], list) or any(not isinstance(v, str) or not v for v in access[key]):
+                    raise ValueError('invalid identity claims')
+            assurance = access['assurance']
+            if (assurance.get('level') != 'aal2' or assurance.get('mfa') is not True
+                    or assurance.get('source') != 'key-cape' or assurance.get('methods') != ['pwd', 'otp']
+                    or type(assurance.get('at')) is not int or not -30 <= self.clock() - assurance['at'] <= 900):
+                raise ValueError('fresh MFA required')
+            actor = Actor(self.issuer, access['sub'], TENANT, tuple(access['roles']),
+                          min(access['exp'], identity['exp'], self.clock() + 900), secrets.token_urlsafe(32),
+                          assurance=dict(assurance), groups=tuple(access['groups']), tenant_source=access['tenant_source'])
+            with self.lock:
+                self.prune()
+                if len(self.sessions) >= 1024:
+                    raise ValueError('session capacity')
+                sid = secrets.token_urlsafe(32)
+                self.sessions[sid] = actor
+            return sid, pending['return_to']
+        except (jwt.PyJWTError, KeyError, TypeError, AttributeError):
+            raise ValueError('invalid issuer response') from None
+
+    def session(self, sid):
+        with self.lock:
+            self.prune()
+            return self.sessions.get(sid)
+
+    def logout(self, sid):
+        with self.lock:
+            self.sessions.pop(sid, None)
diff --git a/scripts/alert_policy.py b/scripts/alert_policy.py
new file mode 100644
index 0000000..bb8858f
--- /dev/null
+++ b/scripts/alert_policy.py
@@ -0,0 +1,111 @@
+"""Consume native Flex Auth decisions with exact request and package binding.
+
+Wire canonicalization follows the existing Informed Decision consumer contract:
+Go struct field order, sorted maps and Go JSON HTML escaping. No local allow rule.
+"""
+from datetime import datetime
+import hashlib
+import json
+import re
+import time
+import uuid
+
+from telemetry_http import Transport, origin
+
+DIGEST = re.compile(r'sha256:[0-9a-f]{64}')
+
+
+def request_digest(request):
+    def ordered(value):
+        if isinstance(value, dict):
+            return {key: ordered(value[key]) for key in sorted(value)}
+        if isinstance(value, list):
+            return [ordered(v) for v in value]
+        if value is None or type(value) in (str, bool) or type(value) is int and abs(value) <= 2**53:
+            return value
+        raise ValueError('unsupported policy input')
+    def ref(value, fields):
+        return {k: ordered(value[k]) for k in fields if value.get(k)}
+    material = dict(tenant=request['tenant'],
+        subject=ref(request['subject'], ('id', 'type', 'tenant', 'attributes')),
+        action=request['action'],
+        resource=ref(request['resource'], ('id', 'type', 'system', 'tenant', 'attributes')))
+    if request.get('context'):
+        material['context'] = ordered(request['context'])
+    raw = json.dumps(material, ensure_ascii=False, separators=(',', ':'), allow_nan=False)
+    for char, escaped in (('<', r'\u003c'), ('>', r'\u003e'), ('&', r'\u0026'), ('\u2028', r'\u2028'), ('\u2029', r'\u2029')):
+        raw = raw.replace(char, escaped)
+    return 'sha256:' + hashlib.sha256(raw.encode()).hexdigest()
+
+
+def timestamp(value):
+    parsed = datetime.fromisoformat(value.replace('Z', '+00:00'))
+    if parsed.tzinfo is None:
+        raise ValueError('missing timezone')
+    return parsed.timestamp()
+
+
+class Policy:
+    def __init__(self, endpoint, token_provider, package, version, digest, *, transport=None, clock=time.time):
+        self.endpoint = origin(endpoint, internal=True) + '/v1/check'
+        if not package or not version or not DIGEST.fullmatch(digest):
+            raise ValueError('pinned policy required')
+        self.package, self.version, self.digest = package, version, digest
+        self.token_provider, self.transport, self.clock = token_provider, transport or Transport(), clock
+
+    def __call__(self, actor, action, resource):
+        deny = {'effect': 'deny', 'id': '', 'expires_at': 0}
+        if action not in ('read', 'acknowledge') or not re.fullmatch(r'alert:[0-9a-f-]{36}', resource):
+            return deny
+        tenant_source = {'directory': 'directory-asserted', 'registration': 'registration-supplied'}.get(actor.tenant_source)
+        if not tenant_source:
+            return deny
+        request = dict(id=str(uuid.uuid4()), tenant='tenant:platform',
+            subject=dict(id=actor.subject, type=actor.principal_type, tenant=actor.tenant,
+                         attributes=dict(issuer=actor.issuer, roles=list(actor.roles), groups=list(actor.groups),
+                                         assurance=actor.assurance, tenant_source=tenant_source,
+                                         principal_type_source='authentication-derived')),
+            action=action, resource=dict(id=resource, type='telemetry-alert', system='railiance-telemetry',
+                                        tenant='tenant:platform'), policy_version=self.version)
+        # Registry assignments and current authentication evidence are distinct.
+        # Registry enrichment may replace subject attributes; it must not replace
+        # the live signed MFA/role observations used for revocation/freshness.
+        request['context'] = {'authentication': dict(request['subject']['attributes'])}
+        started = self.clock()
+        try:
+            token = self.token_provider()
+            if not isinstance(token, str) or not 1 <= len(token) <= 32768 or any(ord(c) < 33 or ord(c) > 126 for c in token):
+                return deny
+            status, data = self.transport.request('POST', self.endpoint,
+                json.dumps(request, separators=(',', ':'), ensure_ascii=False).encode(),
+                {'Content-Type': 'application/json', 'Authorization': 'Bearer ' + token})
+            if (status != 200 or data.get('contract_version') != 'flex-auth.decision-record.v1'
+                    or data.get('request_id') != request['id'] or data.get('effect') != 'allow'
+                    or data.get('obligations', []) != [] or not isinstance(data.get('id'), str) or not data['id']):
+                return deny
+            binding, provenance = data['binding'], data['provenance']
+            if (binding['submitted_request_digest'] != request_digest(request)
+                    or not DIGEST.fullmatch(binding['request_digest'])
+                    or binding['tenant'] != request['tenant'] or binding['action'] != action
+                    or binding.get('context', {}) != request.get('context', {})):
+                return deny
+            for key, fields in (('subject', ('id', 'type', 'tenant')),
+                                ('resource', ('id', 'type', 'system', 'tenant'))):
+                for name in fields:
+                    if binding[key].get(name) != request[key].get(name) or data[key].get(name) != binding[key].get(name):
+                        return deny
+            if (provenance['policy_package'] != self.package or provenance['policy_version'] != self.version
+                    or provenance['policy_package_digest'] != self.digest
+                    or data['matched_policy_version'] != self.version
+                    or not DIGEST.fullmatch(provenance['registry_snapshot_digest'])
+                    or not provenance['evaluator'].startswith('flex-auth/')
+                    or not started - 30 <= timestamp(provenance['decision_time']) <= self.clock() + 30):
+                return deny
+            lifetime = data['lifetime']
+            until = min(timestamp(lifetime['expires_at']), started + 30, actor.expires_at)
+            if (lifetime['kind'] != 'ttl' or until <= self.clock()
+                    or timestamp(lifetime.get('not_before', provenance['decision_time'])) > self.clock()):
+                return deny
+            return {'effect': 'allow', 'id': data['id'], 'expires_at': until}
+        except (OSError, KeyError, ValueError, TypeError, AttributeError):
+            return deny
diff --git a/scripts/alert_service.py b/scripts/alert_service.py
new file mode 100644
index 0000000..a8f83bd
--- /dev/null
+++ b/scripts/alert_service.py
@@ -0,0 +1,129 @@
+#!/usr/bin/env python3
+"""Single-process private acknowledgment runtime, packaged by rapp-telemetry."""
+import argparse
+from http.cookies import SimpleCookie
+import json
+import os
+from pathlib import Path
+import secrets
+import signal
+import threading
+import time
+from urllib.parse import parse_qs
+
+from alert_ack import Application, Store
+from alert_audit import AuditTransport
+from alert_identity import Login
+from alert_policy import Policy
+
+
+def credential(path):
+    # Kubernetes projected credentials use symlinks; mount ownership is the
+    # package trust boundary. Resolve once per call so rotations are picked up.
+    with Path(path).open('rb') as source:
+        raw = source.read(32769)
+    value = raw.decode().strip()
+    if not 32 <= len(value) <= 32768 or any(ord(c) < 33 or ord(c) > 126 for c in value):
+        raise ValueError('invalid credential projection')
+    return value
+
+
+class Router:
+    def __init__(self, config, store, *, login=None, policy=None):
+        self.config, self.store = config, store
+        self.login = login or Login(config['issuer'], config['origin'])
+        self.policy = policy or Policy(config['policy']['origin'],
+            lambda: credential(config['policy']['token_file']), config['policy']['package'],
+            config['policy']['version'], config['policy']['digest'])
+        self.application = Application(store, config['origin'], credential(config['webhook_token_file']),
+                                       self.actor, self.policy)
+        self.last_drain = 0
+
+    @staticmethod
+    def cookie(env, name):
+        cookies = SimpleCookie()
+        try:
+            cookies.load(env.get('HTTP_COOKIE', ''))
+            return cookies[name].value if name in cookies else ''
+        except Exception:
+            return ''
+
+    def actor(self, env):
+        return self.login.session(self.cookie(env, '__Host-rtel-session'))
+
+    def __call__(self, env, start):
+        def reply(status, text='', headers=()):
+            start(status, [('Content-Type', 'text/plain; charset=utf-8'), ('Cache-Control', 'no-store'),
+                           ('Referrer-Policy', 'no-referrer'), ('X-Content-Type-Options', 'nosniff'),
+                           ('Content-Security-Policy', "default-src 'none'; frame-ancestors 'none'")] + list(headers))
+            return [text.encode()]
+        def cookie(name, value, age):
+            return ('Set-Cookie', f'{name}={value}; Path=/; Secure; HttpOnly; SameSite=Lax; Max-Age={age}')
+        path, method = env.get('PATH_INFO'), env.get('REQUEST_METHOD')
+        try:
+            if method == 'GET' and path in ('/healthz', '/readyz'):
+                ready = path == '/healthz' or time.time() - self.last_drain < 90 and not self.store.audit_debt()
+                return reply('200 OK' if ready else '503 Service Unavailable', 'ready' if ready else 'audit delivery pending')
+            if path == '/ack/auth/callback' and method == 'GET':
+                params = parse_qs(env.get('QUERY_STRING', ''), strict_parsing=True, max_num_fields=4)
+                if any(len(v) != 1 for v in params.values()) or not {'state', 'code'} <= set(params):
+                    raise ValueError('invalid callback')
+                sid, target = self.login.finish(params['state'][0], self.cookie(env, '__Host-rtel-login'), params['code'][0])
+                return reply('303 See Other', headers=[('Location', target), cookie('__Host-rtel-session', sid, 900),
+                                                       cookie('__Host-rtel-login', '', 0)])
+            if path == '/ack/logout' and method == 'POST':
+                actor = self.actor(env)
+                form = parse_qs(Application.body(env).decode(), max_num_fields=1, strict_parsing=True)
+                if (not actor or env.get('HTTP_ORIGIN') != self.config['origin'] or set(form) != {'csrf'}
+                        or len(form['csrf']) != 1 or not secrets.compare_digest(actor.csrf, form['csrf'][0])):
+                    return reply('403 Forbidden', 'Invalid sign-out.')
+                self.login.logout(self.cookie(env, '__Host-rtel-session'))
+                return reply('200 OK', 'Signed out.', [cookie('__Host-rtel-session', '', 0)])
+            if path == '/ack/alerts' and method == 'GET' and self.actor(env) is None:
+                target = path + '?' + env.get('QUERY_STRING', '')
+                url, browser = self.login.start(target)
+                return reply('303 See Other', headers=[('Location', url), cookie('__Host-rtel-login', browser, 300)])
+            # Refresh the webhook credential for projected rotation; never store it in SQLite.
+            if path == '/webhook':
+                self.application.webhook_token = credential(self.config['webhook_token_file'])
+            return self.application(env, start)
+        except (ValueError, OSError, KeyError, TypeError):
+            return reply('503 Service Unavailable', 'Identity or service unavailable. Retry later.')
+
+
+def main():
+    from waitress import serve
+    parser = argparse.ArgumentParser(description=__doc__)
+    parser.add_argument('--config', required=True, type=Path)
+    args = parser.parse_args()
+    os.umask(0o077)
+    config = json.loads(args.config.read_text())
+    Path(config['database']).parent.mkdir(mode=0o700, exist_ok=True)
+    store = Store(config['database'])
+    router = Router(config, store)
+    transport = AuditTransport(config['audit']['origin'], lambda: credential(config['audit']['token_file']),
+                               allow_internal_http=True)
+    stop = threading.Event()
+    def drain():
+        while not stop.is_set():
+            try:
+                store.drain(transport)
+                router.last_drain = time.time()
+            except (OSError, ValueError):
+                router.last_drain = 0
+            stop.wait(30)
+    worker = threading.Thread(target=drain, daemon=True)
+    worker.start()
+    def shutdown(*args):
+        raise SystemExit(0)
+    signal.signal(signal.SIGTERM, shutdown)
+    try:
+        serve(router, host='0.0.0.0', port=8080, threads=4, max_request_body_size=32768,
+              clear_untrusted_proxy_headers=True)
+    finally:
+        stop.set()
+        worker.join(timeout=6)
+
+
+if __name__ == '__main__':
+    main()
diff --git a/scripts/telemetry_http.py b/scripts/telemetry_http.py
new file mode 100644
index 0000000..2106dbb
--- /dev/null
+++ b/scripts/telemetry_http.py
@@ -0,0 +1,46 @@
+"""Bounded HTTP transport; endpoint configuration is never supplied by callers."""
+import json
+from http.client import HTTPException
+from urllib.error import HTTPError, URLError
+from urllib.parse import urlsplit
+from urllib.request import HTTPRedirectHandler, ProxyHandler, Request, build_opener
+
+
+def origin(value, internal=False):
+    p = urlsplit(value)
+    local = p.hostname in ('127.0.0.1', '::1') or (p.hostname or '').endswith(('.svc', '.svc.cluster.local'))
+    if (p.scheme != 'https' and not (internal and local and p.scheme == 'http')
+            or not p.hostname or p.username or p.password or p.path or p.query or p.fragment
+            or any(c.isspace() for c in value)):
+        raise ValueError('invalid fixed origin')
+    return value
+
+
+class NoRedirect(HTTPRedirectHandler):
+    def redirect_request(self, *args, **kwargs):
+        return None
+
+
+class Transport:
+    def __init__(self):
+        self.opener = build_opener(ProxyHandler({}), NoRedirect())
+
+    def request(self, method, url, body=None, headers=None):
+        try:
+            try:
+                response = self.opener.open(Request(url, data=body, headers=headers or {}, method=method), timeout=5)
+            except HTTPError as error:
+                response = error
+            with response:
+                status = response.code
+                if status >= 300:
+                    return status, {}
+                raw = response.read(262145)
+                if len(raw) > 262144:
+                    raise ValueError()
+                data = json.loads(raw)
+                if not isinstance(data, dict):
+                    raise ValueError()
+                return status, data
+        except (OSError, URLError, HTTPException, ValueError, UnicodeError):
+            raise OSError('upstream unavailable or invalid') from None
diff --git a/templates/alert-email.tmpl b/templates/alert-email.tmpl
new file mode 100644
index 0000000..762cc00
--- /dev/null
+++ b/templates/alert-email.tmpl
@@ -0,0 +1,15 @@
+{{ define "railiance.alert.email" }}
+Railiance alert notification
+
+{{ range .Alerts }}
+Alert: {{ .Labels.alertname }}
+State: {{ .Status }}
+Started: {{ .StartsAt.Format "2006-01-02T15:04:05.999999999Z07:00" }}
+
+Review and acknowledge receipt:
+https://telemetry.coulomb.social/ack/alerts?fingerprint={{ .Fingerprint | urlquery }}&starts_at={{ .StartsAt.Format "2006-01-02T15:04:05.999999999Z07:00" | urlquery }}
+
+Sign in as a Railiance admin, then select Acknowledge receipt.
+Opening this link does not acknowledge, resolve or silence the alert.
+{{ end }}
+{{ end }}
diff --git a/tests/test_alert_ack.py b/tests/test_alert_ack.py
new file mode 100644
index 0000000..ac13983
--- /dev/null
+++ b/tests/test_alert_ack.py
@@ -0,0 +1,158 @@
+from dataclasses import replace
+import io
+import json
+import os
+from pathlib import Path
+import sqlite3
+import sys
+import tempfile
+import unittest
+from urllib.parse import urlencode
+
+sys.path.insert(0, str(Path(__file__).resolve().parents[1] / 'scripts'))
+from alert_ack import Actor, Application, Store, occurrence
+
+NOW = 1790553600  # 2026-09-28 UTC
+START = '2026-09-28T00:00:00Z'
+
+
+class AcknowledgmentTests(unittest.TestCase):
+    def setUp(self):
+        self.temp = tempfile.TemporaryDirectory()
+        self.addCleanup(self.temp.cleanup)
+        self.path = Path(self.temp.name) / 'ack.db'
+        self.store = Store(self.path)
+        self.actor = Actor('https://issuer.example', 'test-human', 'tenant:platform',
+                           ('railiance-admin',), NOW + 900, 'c' * 32)
+        self.decision = {'id': 'test-decision', 'effect': 'allow', 'expires_at': NOW + 30}
+        self.app = Application(self.store, 'https://telemetry.example', 'w' * 32,
+                               lambda env: self.actor, lambda *args: self.decision,
+                               clock=lambda: NOW)
+        self.alert = {'status': 'firing', 'fingerprint': '0123456789abcdef',
+                      'startsAt': START, 'labels': {'alertname': 'TestFailure', 'owner': 'railiance-telemetry'}}
+        self.payload = {'version': '4', 'receiver': 'railiance-admin-email', 'alerts': [self.alert]}
+        self.identity = occurrence(self.alert['fingerprint'], START)
+        self.query = urlencode({'fingerprint': self.alert['fingerprint'], 'starts_at': START})
+
+    def request(self, method='GET', path='/ack/alerts', body=b'', **extra):
+        env = {'REQUEST_METHOD': method, 'PATH_INFO': path, 'QUERY_STRING': self.query,
+               'CONTENT_LENGTH': str(len(body)), 'wsgi.input': io.BytesIO(body),
+               'HTTP_ORIGIN': 'https://telemetry.example'}
+        env.update(extra)
+        result = {}
+        raw = b''.join(self.app(env, lambda status, headers: result.update(status=status, headers=headers)))
+        return result['status'], raw.decode()
+
+    def receive(self):
+        self.store.receive(self.payload, NOW)
+
+    def post(self, **kw):
+        return self.request('POST', body=urlencode({'csrf': self.actor.csrf}).encode(), **kw)
+
+    def test_scanner_get_does_not_acknowledge(self):
+        self.receive()
+        status, page = self.request()
+        self.assertEqual(status, '200 OK')
+        self.assertIn('Acknowledge receipt', page)
+        self.assertIsNone(self.store.get(self.identity)['occurred_at'])
+        with self.store.connect() as db:
+            self.assertEqual(db.execute('SELECT COUNT(*) FROM outbox').fetchone()[0], 0)
+
+    def test_click_commits_ack_and_audit_once_across_restart(self):
+        self.receive()
+        self.assertIn('Audit delivery pending', self.post()[1])
+        self.store = Store(self.path)
+        self.app.store = self.store
+        self.post()
+        with self.store.connect() as db:
+            rows = db.execute('SELECT body FROM outbox').fetchall()
+        self.assertEqual(len(rows), 1)
+        event = json.loads(rows[0]['body'])
+        self.assertEqual(event['data']['actor_subject'], 'test-human')
+        self.assertEqual(event['data']['role'], 'railiance-admin')
+        self.assertEqual(event['subject'], 'alert:' + self.identity)
+        self.assertEqual(event['type'], 'telemetry.alert.acknowledged')
+
+    def test_failed_outbox_rolls_back_ack(self):
+        self.receive()
+        with self.store.connect() as db:
+            db.execute("CREATE TRIGGER simulate_full BEFORE INSERT ON outbox BEGIN SELECT RAISE(ABORT, 'full'); END")
+        self.assertEqual(self.post()[0], '503 Service Unavailable')
+        self.assertIsNone(self.store.get(self.identity)['occurred_at'])
+
+    def test_wrong_actor_role_tenant_service_expiry_denied(self):
+        self.receive()
+        original = self.actor
+        for change in ({'roles': ()}, {'tenant': 'tenant:other'}, {'principal_type': 'service'}, {'expires_at': NOW}):
+            self.actor = replace(original, **change)
+            self.assertIn(self.post()[0], ('401 Unauthorized', '403 Forbidden'))
+        self.assertIsNone(self.store.get(self.identity)['occurred_at'])
+
+    def test_email_or_headers_do_not_grant_role(self):
+        self.receive()
+        self.actor = replace(self.actor, roles=())
+        self.assertEqual(self.post(HTTP_X_EMAIL='bernd.worsch@gmail.com', HTTP_X_ROLE='railiance-admin')[0], '403 Forbidden')
+
+    def test_origin_csrf_and_expired_pdp_denied(self):
+        self.receive()
+        self.assertEqual(self.post(HTTP_ORIGIN='https://attacker.example')[0], '403 Forbidden')
+        self.assertEqual(self.request('POST', body=b'csrf=wrong')[0], '403 Forbidden')
+        self.decision['expires_at'] = NOW
+        self.assertEqual(self.post()[0], '403 Forbidden')
+        self.assertIsNone(self.store.get(self.identity)['occurred_at'])
+
+    def test_webhook_auth_and_retry_and_batch_rollback(self):
+        raw = json.dumps(self.payload).encode()
+        self.assertEqual(self.request('POST', '/webhook', raw)[0], '401 Unauthorized')
+        for _ in range(2):
+            self.assertEqual(self.request('POST', '/webhook', raw, HTTP_AUTHORIZATION='Bearer ' + 'w' * 32)[0], '200 OK')
+        changed = json.loads(raw)
+        changed['alerts'][0]['labels']['alertname'] = 'Different'
+        with self.assertRaises(ValueError): self.store.receive(changed, NOW)
+        self.assertEqual(self.store.get(self.identity)['alertname'], 'TestFailure')
+
+    def test_new_firing_occurrence_requires_new_ack(self):
+        self.receive()
+        self.post()
+        self.alert['startsAt'] = '2026-09-27T23:59:59Z'
+        other = self.store.receive(self.payload, NOW)[0]
+        self.assertNotEqual(other, self.identity)
+        self.assertIsNone(self.store.get(other)['occurred_at'])
+
+    def test_lost_audit_receipt_replays_original_event(self):
+        self.receive()
+        self.post()
+        sent = []
+        def lost(event):
+            sent.append(event)
+            raise TimeoutError()
+        self.store.drain(lost)
+        def duplicate(event):
+            self.assertEqual(event, sent[0])
+            return 200, {'status': 'duplicate', 'reference': 'audit:' + event['id']}
+        self.store.drain(duplicate)
+        self.assertEqual(self.store.get(self.identity)['audit_status'], 'delivered')
+        self.assertIn('Audit record archived', self.request()[1])
+
+    def test_audit_refusal_retained_and_wrong_receipt_not_accepted(self):
+        self.receive()
+        self.post()
+        self.store.drain(lambda event: (202, {'status': 'accepted', 'reference': 'wrong'}))
+        self.assertEqual(self.store.get(self.identity)['audit_status'], 'pending')
+        self.store.drain(lambda event: (403, {}))
+        self.assertEqual(self.store.get(self.identity)['audit_status'], 'blocked')
+        self.assertIn('Audit delivery pending', self.request()[1])
+        self.assertEqual(self.store.audit_debt(), {'blocked': 1})
+        with self.store.connect() as db:
+            event = json.loads(db.execute('SELECT body FROM outbox').fetchone()[0])
+        self.assertTrue(self.store.requeue(event['id']))
+        self.store.drain(lambda value: (202, {'status': 'accepted', 'reference': 'audit:' + value['id']}))
+        self.assertEqual(self.store.audit_debt(), {})
+
+    def test_unsafe_database_refused(self):
+        os.chmod(self.path, 0o644)
+        with self.assertRaises(ValueError): Store(self.path)
+
+
+if __name__ == '__main__':
+    unittest.main()
diff --git a/tests/test_alert_audit_native.py b/tests/test_alert_audit_native.py
new file mode 100644
index 0000000..03e2424
--- /dev/null
+++ b/tests/test_alert_audit_native.py
@@ -0,0 +1,48 @@
+"""Opt in with RTEL_AUDIT_CORE_SOURCE; uses the real receiver, synthetic custody."""
+import io
+import json
+import os
+from pathlib import Path
+import sys
+import tempfile
+import unittest
+
+sys.path.insert(0, str(Path(__file__).resolve().parents[1] / 'scripts'))
+from alert_ack import Actor, Store
+
+
+@unittest.skipUnless(os.environ.get('RTEL_AUDIT_CORE_SOURCE'), 'set RTEL_AUDIT_CORE_SOURCE for real receiver check')
+class NativeAuditTests(unittest.TestCase):
+    def test_real_receiver_accepts_and_deduplicates_after_lost_reply(self):
+        sys.path.insert(0, os.environ['RTEL_AUDIT_CORE_SOURCE'])
+        from audit_core.ingestion import IngestionApplication
+        from audit_core.senders import SenderIdentity, SenderRegistry
+        from audit_core.sqlite_backend import SQLiteAuditBackend
+        with tempfile.TemporaryDirectory() as tmp:
+            store = Store(Path(tmp) / 'ack.db')
+            identity = store.receive({'version': '4', 'receiver': 'railiance-admin-email', 'alerts': [
+                {'status': 'firing', 'fingerprint': '0123456789abcdef', 'startsAt': '2026-09-28T00:00:00Z',
+                 'labels': {'alertname': 'ControlledFailure', 'owner': 'railiance-telemetry'}}]}, 1790553600)[0]
+            store.acknowledge(identity, Actor('https://issuer.example', 'fixture-human', 'tenant:platform',
+                              ('railiance-admin',), 1790554500, 'c' * 32), 'fixture-decision', 1790553600)
+            sender = SenderIdentity(name='railiance-telemetry', tokens=('fixture-only',),
+                sources=frozenset({'railiance-telemetry'}), tenants=frozenset({'tenant:platform'}),
+                evidence_kind='load-bearing', may_read=False)
+            app = IngestionApplication(SQLiteAuditBackend(str(Path(tmp) / 'audit.db')), SenderRegistry([sender]))
+            calls = []
+            def send(event):
+                raw = json.dumps(event).encode()
+                env = {'REQUEST_METHOD': 'POST', 'PATH_INFO': '/v1/events',
+                       'CONTENT_LENGTH': str(len(raw)), 'wsgi.input': io.BytesIO(raw),
+                       'HTTP_AUTHORIZATION': 'Bearer fixture-only', 'HTTP_IDEMPOTENCY_KEY': event['id']}
+                response = {}
+                body = b''.join(app(env, lambda status, headers: response.update(status=int(status[:3]))))
+                calls.append(response['status'])
+                if len(calls) == 1:
+                    raise TimeoutError('simulated lost response')
+                return response['status'], json.loads(body)
+            store.drain(send)
+            store = Store(Path(tmp) / 'ack.db')
+            store.drain(send)
+            self.assertEqual(calls, [202, 200])
+            self.assertEqual(store.get(identity)['audit_status'], 'delivered')
diff --git a/tests/test_alert_audit_transport.py b/tests/test_alert_audit_transport.py
new file mode 100644
index 0000000..65fc901
--- /dev/null
+++ b/tests/test_alert_audit_transport.py
@@ -0,0 +1,50 @@
+from http.server import BaseHTTPRequestHandler, ThreadingHTTPServer
+import json
+from pathlib import Path
+import sys
+import threading
+import unittest
+
+sys.path.insert(0, str(Path(__file__).resolve().parents[1] / 'scripts'))
+from alert_audit import AuditTransport
+
+
+class AuditTransportTests(unittest.TestCase):
+    def test_real_http_headers_and_redirect_refusal(self):
+        calls = []
+        class Handler(BaseHTTPRequestHandler):
+            def log_message(self, *args):
+                pass
+
+            def do_POST(self):
+                calls.append((self.path, self.headers['Authorization'], self.headers['Idempotency-Key']))
+                body = json.loads(self.rfile.read(int(self.headers['Content-Length'])))
+                if body['id'] == 'redirect':
+                    self.send_response(302)
+                    self.send_header('Location', '/credential-leak')
+                    self.end_headers()
+                    return
+                self.send_response(202)
+                self.end_headers()
+                self.wfile.write(json.dumps({'status': 'accepted', 'reference': 'audit:' + body['id']}).encode())
+
+        server = ThreadingHTTPServer(('127.0.0.1', 0), Handler)
+        thread = threading.Thread(target=server.serve_forever)
+        thread.start()
+        try:
+            transport = AuditTransport(f'http://127.0.0.1:{server.server_port}',
+                                       lambda: 'fixture-credential', allow_internal_http=True)
+            self.assertEqual(transport({'id': 'test'}), (202, {'status': 'accepted', 'reference': 'audit:test'}))
+            self.assertEqual(transport({'id': 'redirect'}), (302, {}))
+            self.assertEqual(calls, [('/v1/events', 'Bearer fixture-credential', 'test'),
+                                     ('/v1/events', 'Bearer fixture-credential', 'redirect')])
+        finally:
+            server.shutdown()
+            thread.join()
+            server.server_close()
+
+    def test_public_cleartext_and_credentialed_origin_refused(self):
+        for origin in ('http://audit.example', 'https://user:password@audit.example',
+                       'https://audit.example/other', 'https://audit.example?next=elsewhere'):
+            with self.assertRaises(ValueError):
+                AuditTransport(origin, lambda: 'fixture', allow_internal_http=True)
diff --git a/tests_runtime/test_identity_policy.py b/tests_runtime/test_identity_policy.py
new file mode 100644
index 0000000..cfa75e6
--- /dev/null
+++ b/tests_runtime/test_identity_policy.py
@@ -0,0 +1,131 @@
+from dataclasses import replace
+from datetime import datetime, timezone
+import json
+from pathlib import Path
+import sys
+import time
+import unittest
+from urllib.parse import parse_qs, urlsplit
+
+import jwt
+from cryptography.hazmat.primitives.asymmetric import rsa
+
+sys.path.insert(0, str(Path(__file__).resolve().parents[1] / 'scripts'))
+from alert_identity import Login, SCOPES
+from alert_policy import Policy, request_digest
+from alert_ack import Actor
+
+
+class Issuer:
+    def __init__(self):
+        self.key = rsa.generate_private_key(public_exponent=65537, key_size=2048)
+        self.jwk = json.loads(jwt.algorithms.RSAAlgorithm.to_jwk(self.key.public_key()))
+        self.jwk.update(kid='fixture', use='sig', alg='RS256')
+        self.nonce = ''
+        self.change = lambda c: c
+
+    def request(self, method, url, body=None, headers=None):
+        if url.endswith('/.well-known/openid-configuration'):
+            return 200, dict(issuer='https://issuer.example', authorization_endpoint='https://issuer.example/authorize',
+                             token_endpoint='https://issuer.example/token', jwks_uri='https://issuer.example/jwks',
+                             code_challenge_methods_supported=['S256'])
+        if url.endswith('/jwks'):
+            return 200, {'keys': [self.jwk]}
+        now = int(time.time())
+        claims = dict(iss='https://issuer.example', sub='fixture-human', aud='railiance-telemetry-admin',
+                      iat=now, exp=now + 600, nonce=self.nonce, tenant='tenant:platform',
+                      tenant_source='registration', principal_type='human', groups=[], roles=['railiance-admin'],
+                      assurance=dict(level='aal2', mfa=True, source='key-cape', methods=['pwd', 'otp'], at=now))
+        claims = self.change(claims)
+        identity = jwt.encode(claims, self.key, algorithm='RS256', headers={'kid': 'fixture'})
+        access = dict(claims, aud='railiance-telemetry', scope=' '.join(SCOPES))
+        return 200, dict(id_token=identity, access_token=jwt.encode(access, self.key, algorithm='RS256', headers={'kid': 'fixture'}))
+
+
+class IdentityTests(unittest.TestCase):
+    def setUp(self):
+        self.issuer = Issuer()
+        self.login = Login('https://issuer.example', 'https://telemetry.example', transport=self.issuer)
+
+    def start(self):
+        url, browser = self.login.start('/ack/alerts?fingerprint=0123456789abcdef&starts_at=2026-09-28T00:00:00Z')
+        params = parse_qs(urlsplit(url).query)
+        self.issuer.nonce = params['nonce'][0]
+        self.assertEqual(params['code_challenge_method'], ['S256'])
+        return params['state'][0], browser
+
+    def actor(self):
+        state, browser = self.start()
+        sid, target = self.login.finish(state, browser, 'fixture-code')
+        return self.login.session(sid)
+
+    def test_verified_human_session_and_logout(self):
+        state, browser = self.start()
+        sid, target = self.login.finish(state, browser, 'fixture-code')
+        actor = self.login.session(sid)
+        self.assertEqual(actor.subject, 'fixture-human')
+        self.assertEqual(actor.roles, ('railiance-admin',))
+        self.assertLessEqual(actor.expires_at, time.time() + 600)
+        self.login.logout(sid)
+        self.assertIsNone(self.login.session(sid))
+        with self.assertRaises(ValueError): self.login.finish(state, browser, 'fixture-code')
+
+    def test_wrong_browser_and_state_replay_refused(self):
+        state, browser = self.start()
+        with self.assertRaises(ValueError): self.login.finish(state, 'other', 'fixture-code')
+        with self.assertRaises(ValueError): self.login.finish(state, browser, 'fixture-code')
+
+    def test_nonce_wrong_issuer_wrong_tenant_and_weak_mfa(self):
+        for changes in ({'nonce': 'wrong'}, {'iss': 'https://other.example'}, {'tenant': 'tenant:other'},
+                        {'principal_type': 'service'}, {'assurance': {'mfa': False}}, {'exp': 1}):
+            self.issuer.change = lambda claims, changes=changes: dict(claims, **changes)
+            state, browser = self.start()
+            with self.assertRaises(ValueError): self.login.finish(state, browser, 'fixture-code')
+
+    def test_return_path_cannot_escape_surface(self):
+        for value in ('https://attacker.example/ack/alerts', '//attacker.example/ack/alerts', '/other'):
+            with self.assertRaises(ValueError): self.login.start(value)
+
+
+class DecisionTransport:
+    def __init__(self):
+        self.change = lambda response: response
+
+    def request(self, method, url, body=None, headers=None):
+        request = json.loads(body)
+        now = time.time()
+        stamp = lambda delta: datetime.fromtimestamp(now + delta, timezone.utc).isoformat()
+        response = dict(id='fixture-decision', request_id=request['id'], contract_version='flex-auth.decision-record.v1',
+            effect='allow', obligations=[], matched_policy_version='v1', subject=request['subject'], resource=request['resource'],
+            binding=dict(tenant=request['tenant'], action=request['action'], subject=request['subject'], resource=request['resource'],
+                         context=request.get('context', {}),
+                         submitted_request_digest=request_digest(request), request_digest='sha256:' + 'b' * 64),
+            provenance=dict(policy_package='telemetry.ack', policy_version='v1', policy_package_digest='sha256:' + 'a' * 64,
+                            registry_snapshot_digest='sha256:' + 'c' * 64, evaluator='flex-auth/fixture', decision_time=stamp(0)),
+            lifetime=dict(kind='ttl', not_before=stamp(-1), expires_at=stamp(30)))
+        return 200, self.change(response)
+
+
+class PolicyTests(unittest.TestCase):
+    def test_policy_pins_and_action_bindings_fail_closed(self):
+        actor = Actor('https://issuer.example', 'fixture-human', 'tenant:platform', ('railiance-admin',),
+                      time.time() + 600, 'c' * 32, tenant_source='directory')
+        transport = DecisionTransport()
+        policy = Policy('https://policy.example', lambda: 'fixture-workload-token', 'telemetry.ack', 'v1',
+                        'sha256:' + 'a' * 64, transport=transport)
+        resource = 'alert:11111111-1111-1111-1111-111111111111'
+        self.assertEqual(policy(actor, 'acknowledge', resource)['effect'], 'allow')
+        mutations = [lambda r: dict(r, effect='deny'), lambda r: dict(r, obligations=['unknown']),
+                     lambda r: dict(r, request_id='other'),
+                     lambda r: dict(r, binding=dict(r['binding'], action='read')),
+                     lambda r: dict(r, binding=dict(r['binding'], submitted_request_digest='sha256:' + '0' * 64)),
+                     lambda r: dict(r, provenance=dict(r['provenance'], policy_package_digest='sha256:' + '0' * 64)),
+                     lambda r: dict(r, lifetime=dict(r['lifetime'], expires_at='2000-01-01T00:00:00Z'))]
+        for change in mutations:
+            transport.change = change
+            self.assertEqual(policy(actor, 'acknowledge', resource)['effect'], 'deny')
+        self.assertEqual(policy(actor, 'delete', resource)['effect'], 'deny')
+
+
+if __name__ == '__main__':
+    unittest.main()
diff --git a/tests_runtime/test_policy_native.py b/tests_runtime/test_policy_native.py
new file mode 100644
index 0000000..70adec3
--- /dev/null
+++ b/tests_runtime/test_policy_native.py
@@ -0,0 +1,42 @@
+from dataclasses import replace
+import json
+import os
+from pathlib import Path
+import subprocess
+import sys
+import tempfile
+import time
+import unittest
+
+ROOT = Path(__file__).resolve().parents[1]
+sys.path.insert(0, str(ROOT / 'scripts'))
+from alert_ack import Actor
+from alert_policy import Policy
+
+
+@unittest.skipUnless(os.environ.get('RTEL_FLEX_AUTH_BINARY'), 'set RTEL_FLEX_AUTH_BINARY')
+class NativePolicyTests(unittest.TestCase):
+    def test_native_wire_digest_and_revoked_or_wrong_identity_denials(self):
+        with tempfile.TemporaryDirectory() as directory:
+            request_file = Path(directory) / 'request.json'
+            class Native:
+                def request(self, method, url, body=None, headers=None):
+                    request_file.write_bytes(body)
+                    result = subprocess.run([os.environ['RTEL_FLEX_AUTH_BINARY'], 'check', '--policy',
+                        str(ROOT / 'integration/telemetry-policy.md'), '--registry', str(ROOT / 'integration/registry.json'),
+                        '--request', str(request_file)], capture_output=True, check=True)
+                    return 200, json.loads(result.stdout)
+            actor = Actor('https://kc.coulomb.social', 'uid=tegwick,ou=people,dc=netkingdom,dc=local',
+                'tenant:platform', ('railiance-admin',), time.time() + 600, 'c' * 32,
+                assurance=dict(level='aal2', mfa=True, source='key-cape', methods=['pwd', 'otp'], at=int(time.time())),
+                groups=('railiance-admins',), tenant_source='directory')
+            # Native digest is pinned by the owner packet, not inferred from a response.
+            policy = Policy('https://policy.example', lambda: 'fixture-only',
+                'railiance-telemetry.alert-acknowledgment', 'v1',
+                'sha256:02938202cf75140d6ab638b8d0fbce6ebb22832354efc89cab040b13e8943f09', transport=Native())
+            resource = 'alert:11111111-1111-1111-1111-111111111111'
+            self.assertEqual(policy(actor, 'acknowledge', resource)['effect'], 'allow')
+            for changed in (replace(actor, roles=()), replace(actor, groups=()), replace(actor, subject='other'),
+                            replace(actor, tenant='tenant:other'), replace(actor, issuer='https://other.example'),
+                            replace(actor, assurance=dict(actor.assurance, at=1))):
+                self.assertEqual(policy(changed, 'acknowledge', resource)['effect'], 'deny')
diff --git a/tests_runtime/test_service.py b/tests_runtime/test_service.py
new file mode 100644
index 0000000..7a62c64
--- /dev/null
+++ b/tests_runtime/test_service.py
@@ -0,0 +1,57 @@
+import io
+from pathlib import Path
+import sys
+import tempfile
+import time
+import unittest
+from urllib.parse import parse_qs, urlencode, urlsplit
+
+sys.path.insert(0, str(Path(__file__).resolve().parents[1] / 'scripts'))
+from alert_ack import Store
+from alert_identity import Login
+from alert_service import Router
+from test_identity_policy import Issuer
+
+
+class ServiceTests(unittest.TestCase):
+    def test_browser_login_confirmation_and_logout(self):
+        with tempfile.TemporaryDirectory() as tmp:
+            token = Path(tmp) / 'webhook-token'
+            token.write_text('w' * 32)
+            store = Store(Path(tmp) / 'state.db')
+            issuer = Issuer()
+            login = Login('https://issuer.example', 'https://telemetry.example', transport=issuer)
+            router = Router({'origin': 'https://telemetry.example', 'webhook_token_file': str(token)}, store,
+                login=login, policy=lambda *args: dict(id='fixture-decision', effect='allow', expires_at=time.time() + 30))
+            query = urlencode(dict(fingerprint='0123456789abcdef', starts_at='2026-09-28T00:00:00Z'))
+            def call(path, method='GET', cookie='', query=query, body=b''):
+                env = dict(PATH_INFO=path, REQUEST_METHOD=method, HTTP_COOKIE=cookie, QUERY_STRING=query,
+                           CONTENT_LENGTH=str(len(body)), HTTP_ORIGIN='https://telemetry.example')
+                env['wsgi.input'] = io.BytesIO(body)
+                result = {}
+                output = b''.join(router(env, lambda status, headers: result.update(status=status, headers=headers)))
+                return result, output.decode()
+            response, _ = call('/ack/alerts')
+            self.assertEqual(response['status'], '303 See Other')
+            headers = dict(response['headers'])
+            browser_cookie = headers['Set-Cookie'].split(';')[0]
+            params = parse_qs(urlsplit(headers['Location']).query)
+            issuer.nonce = params['nonce'][0]
+            response, _ = call('/ack/auth/callback', cookie=browser_cookie,
+                               query=urlencode(dict(state=params['state'][0], code='fixture-code')))
+            self.assertEqual(response['status'], '303 See Other')
+            cookies = [value for key, value in response['headers'] if key == 'Set-Cookie']
+            session_cookie = next(c.split(';')[0] for c in cookies if c.startswith('__Host-rtel-session='))
+            actor = login.session(session_cookie.split('=', 1)[1])
+            identity = store.receive({'version': '4', 'receiver': 'railiance-admin-email', 'alerts': [
+                {'status': 'firing', 'fingerprint': '0123456789abcdef', 'startsAt': '2026-09-28T00:00:00Z',
+                 'labels': {'alertname': 'TestFailure', 'owner': 'railiance-telemetry'}}]}, time.time())[0]
+            response, page = call('/ack/alerts', cookie=session_cookie)
+            self.assertIn('Acknowledge receipt', page)
+            self.assertIsNone(store.get(identity)['occurred_at'])
+            form = urlencode(dict(csrf=actor.csrf)).encode()
+            response, page = call('/ack/alerts', 'POST', session_cookie, body=form)
+            self.assertIn('Receipt acknowledged', page)
+            response, _ = call('/ack/logout', 'POST', session_cookie, query='', body=form)
+            self.assertEqual(response['status'], '200 OK')
+            self.assertIsNone(login.session(session_cookie.split('=', 1)[1]))
diff --git a/workplans/RTEL-WP-0002-signal-contract.md b/workplans/RTEL-WP-0002-signal-contract.md
index d22cd4b..e88d5b9 100644
--- a/workplans/RTEL-WP-0002-signal-contract.md
+++ b/workplans/RTEL-WP-0002-signal-contract.md
@@ -112,3 +112,28 @@ failure/absence acknowledgments, an outside-node watchdog and recurring backup
 ownership. The founder, Bernd Worsch, supplies recipient/admission decisions;
 rapp-telemetry and platform own runtime/custody integration. No additional task
 or workplan was opened, and no live schedule or notification was enabled.
+
+September 28 recipient decision: Bernd Worsch confirmed email to
+`bernd.worsch@gmail.com`, requested the `railiance-admin` role for that user,
+explicit link-based confirmation and acknowledgment records in audit-core, and
+authorized controlled failure/absence drills. Recipient/channel choice is no
+longer a blocker. The native directory group membership is now applied; the updated KeyCape
+issuer is deployed. A real signed-role login remains unproved.
+
+Implemented the bounded acknowledgment component, email link template and audit
+outbox/transport under this same T04. A GET never acknowledges; authenticated
+human role, fresh policy decision, Origin and CSRF checks precede POST. The first
+acknowledgment and audit envelope commit together; retries retain the same event.
+Actual audit-core receiver code accepts then deduplicates after a lost reply and
+process reopen. See `docs/alert-acknowledgment.md` for the concrete owner bindings.
+
+OIDC code/PKCE sessions, a native Flex Auth decision adapter, a background audit
+worker and the package-owned container/manifests are now implemented. The native
+policy evaluator and signed issuer fixtures pass. KeyCape 1164f65 is published
+and deployed; the native directory role grant preserves existing memberships.
+
+T04 stays wait/blocked: the founder selected From `platform@coulomb.social` and
+subsequently created the mailbox; password custody remains pending. Dedicated SMTP/webhook/audit custody, OIDC
+client and enforced PDP caller admission, application rollout, signed identity,
+real email/acknowledgment and independent audit readback remain. Outside-node
+watchdog and recurring backup gates remain. No new task/workplan was created.