diff --git a/approval_engine/cli.py b/approval_engine/cli.py
index 1d44e14..05802af 100644
--- a/approval_engine/cli.py
+++ b/approval_engine/cli.py
@@ -37,7 +37,7 @@ def _parser() -> argparse.ArgumentParser:
     serve.add_argument("--host", default="127.0.0.1")
     serve.add_argument("--port", type=int, default=8787)
     serve.add_argument("--production", action="store_true")
-    serve.add_argument("--tenant", default="platform")
+    serve.add_argument("--tenant", default="tenant:platform")
     serve.add_argument("--jwt-issuer")
     serve.add_argument("--jwt-audience")
     serve.add_argument("--jwks-url")
diff --git a/approval_engine/store.py b/approval_engine/store.py
index e77da4f..455e8d4 100644
--- a/approval_engine/store.py
+++ b/approval_engine/store.py
@@ -165,7 +165,7 @@ class Engine:
         clock: Callable[[], datetime] | None = None,
         freshness_ttl: int = DEFAULT_FRESHNESS_TTL,
         fail_outbox: bool = False,
-        tenant: str = "platform",
+        tenant: str = "tenant:platform",
         auto_migrate: bool = True,
     ) -> None:
         self.path = str(path)
diff --git a/deploy/approval-engine.yaml b/deploy/approval-engine.yaml
index 36649f8..3a549ae 100644
--- a/deploy/approval-engine.yaml
+++ b/deploy/approval-engine.yaml
@@ -64,7 +64,7 @@ spec:
             - --port
             - "8080"
             - --tenant
-            - platform
+            - tenant:platform
             - --jwt-issuer
             - https://kc.coulomb.social
             - --jwt-audience
diff --git a/docs/keycape-service-registrations.md b/docs/keycape-service-registrations.md
index 7fc0b7b..6ac629f 100644
--- a/docs/keycape-service-registrations.md
+++ b/docs/keycape-service-registrations.md
@@ -21,44 +21,57 @@ Required claims remain those in `docs/caller-authentication.md`: `iss`, `sub`,
 | JWKS | `GET /jwks` on the KeyCape service |
 | Scopes | `approval:create`, `approval:read`, `approval:approve`, `approval:revoke`, `approval:supersede`, `approval:consume`, `approval:observe`, `approval:emit` |
 
-## Tenant reconciliation — unresolved, blocks token issuance
+## Tenant — resolved: exact `tenant:platform`
 
-**This is a live collision, not a naming preference.** `ApiApplication.identity`
-compares the verified JWT `tenant` claim to the engine's configured store tenant
-with exact string equality and raises `Forbidden` before any object lookup
+The operator accepted `tenant:platform` as the platform management,
+administration and services tenant (the landlord zone). Decision
+`5ed3fb35-eca9-413a-82b9-95171ba85bf6`, recorded in
+`glas-harness/docs/platform-tenant-decision.md` and relayed by `glas-harness`
+2026-09-06.
+
+**The spelling is the contract.** `ApiApplication.identity` compares the
+verified JWT `tenant` claim to the engine's configured store tenant with exact
+string equality and raises `Forbidden` before any object lookup
 (`approval_engine/api.py:66`). There is no mapping table, no normalisation, and
-no prefix handling anywhere in this engine.
+no prefix handling anywhere in this engine — deliberately. `platform` is **not**
+an accepted alias for `tenant:platform`, and neither is `tenant:coulomb`.
 
-The three values currently in play:
+Rendered values, all three now exactly `tenant:platform`:
 
-| Value | Where it is set | Current content |
+| Value | Where it is set | Content |
 | --- | --- | --- |
-| Store tenant | `deploy/approval-engine.yaml` `--tenant` (CLI default `platform`) | `platform` |
-| JWT `tenant` claim | the client registrations below | `tenant:coulomb` |
-| CheckRequest tenant | flex-auth policy subject | `tenant:platform` — **never read by this engine** |
+| Store tenant | `deploy/approval-engine.yaml` `--tenant` | `tenant:platform` |
+| Store tenant default | `approval_engine/cli.py` `--tenant`, `Engine(tenant=…)` | `tenant:platform` |
+| JWT `tenant` claim | the client registrations below | `tenant:platform` |
+| CheckRequest tenant | flex-auth policy subject | `tenant:platform` |
 
-`platform` != `tenant:coulomb`, so tokens issued under the registrations below
-would be denied `403` on every non-health route. Spelling similarity between
-`platform` and `tenant:platform` is not a mapping either; the flex-auth policy
-subject is a PDP input this engine never inspects, so it cannot participate in
-the comparison at all.
+The CLI and `Engine` defaults were moved off `platform` in the same change. A
+default that differs from the sanctioned value is a trap: a `serve` invocation
+that omits `--tenant` would have come up healthy and then refused every
+authenticated call, which is the failure this decision exists to prevent.
 
-Denial evidence: `tests/test_auth.py::test_wrong_tenant_is_forbidden` — a
-signature-valid token whose tenant differs from the store tenant is refused
-without mutation.
+The flex-auth CheckRequest tenant now matches by spelling, but note it still
+does not participate in this comparison — it is a PDP policy subject this engine
+never reads. Alignment there is a property of the decision, not a mechanism
+here.
 
-**Resolution is an owner decision and is deliberately not taken here.** Either
-KeyCape issues `tenant: platform` to match the store, or this repo's manifest
-sets `--tenant tenant:coulomb` to match the registration. Which is correct
-depends on whether `platform` and `tenant:coulomb` name the same layer — a
-question this engine cannot answer, and answering it wrongly grants a token
-cross-tenant access to the approval store. The values below are left as
-requested until that mapping is stated by an owner, so the mismatch stays
-visible rather than being silently resolved by whichever document was edited
-last.
+Denial evidence:
+
+- `tests/test_auth.py::test_wrong_tenant_is_forbidden` — a signature-valid token
+  whose tenant differs from the store tenant is refused `403` without mutation.
+- `tests/test_auth.py::test_near_miss_tenant_spellings_are_forbidden` — pins the
+  decision's "no alias" clause directly: `platform`, `tenant:coulomb`,
+  `TENANT:PLATFORM`, `tenant:platform ` (trailing space) and `` (empty) are each
+  refused against a `tenant:platform` store, while the exact spelling is
+  admitted. Without a test that *varies* the tenant, a suite of fixtures all
+  carrying the sanctioned value proves nothing about the field.
+
+This resolves the choice of value only. Verification and the remaining admission
+gates — KeyCape actually owning these registrations, credential materialization,
+and the `T03` rollout evidence — are unchanged and still open.
 
 Tracked against `APPROVAL-WP-0002-T01`; related `KEY-WP-0013-T02`,
-`SECRETS-WP-0009-T03`.
+`SECRETS-WP-0009-T03`, `GLAS-WP-0015`.
 
 ## Clients
 
@@ -76,7 +89,7 @@ clients:
     secretRef: env:KEYCAPE_SECRETS_ENGINE_APPROVAL_CLIENT_SECRET
     serviceSubject: service:secrets-engine
     principal_type: service
-    tenant: tenant:coulomb
+    tenant: tenant:platform
     roles: [secrets-engine]
     tokenLifetime: 15m
 
@@ -96,7 +109,7 @@ clients:
     secretRef: env:KEYCAPE_APPROVAL_ENGINE_OPERATOR_CLIENT_SECRET
     serviceSubject: service:approval-engine-operator
     principal_type: service
-    tenant: tenant:coulomb
+    tenant: tenant:platform
     roles: [approval-operator]
     tokenLifetime: 15m
 ```
diff --git a/tests/conftest.py b/tests/conftest.py
index 473fad6..e35226b 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -28,7 +28,7 @@ def app(engine):
         issuer="https://keycape.example",
         audiences=("approval-engine",),
         principal_type="service",
-        tenant="platform",
+        tenant="tenant:platform",
         roles=frozenset({"secrets-engine"}),
         scopes=frozenset(
             {
diff --git a/tests/test_auth.py b/tests/test_auth.py
index ee786c7..bfda2a3 100644
--- a/tests/test_auth.py
+++ b/tests/test_auth.py
@@ -118,7 +118,7 @@ def test_api_requires_scope_and_binds_create_actor(engine):
         issuer="test",
         audiences=("approval-engine",),
         principal_type="service",
-        tenant="platform",
+        tenant="tenant:platform",
         roles=frozenset(),
         scopes=frozenset({"approval:create"}),
         assurance={"level": "aal1"},
@@ -201,6 +201,72 @@ def test_wrong_tenant_is_forbidden(engine):
     assert body["error"] == "forbidden"
 
 
+@pytest.mark.parametrize(
+    "tenant",
+    [
+        "platform",
+        "tenant:coulomb",
+        "TENANT:PLATFORM",
+        "Tenant:Platform",
+        "tenant:platform ",
+        " tenant:platform",
+        "tenant:platform:",
+        "",
+    ],
+)
+def test_near_miss_tenant_spellings_are_forbidden(engine, tenant):
+    """Decision 5ed3fb35 accepted exactly `tenant:platform` with no alias.
+
+    The store comparison is exact string equality, so every near miss below must
+    be refused: the bare `platform` this repo used to serve, the `tenant:coulomb`
+    the registrations used to request, case variants, and whitespace. Varying the
+    field is the point — a suite whose fixtures all carry the sanctioned value
+    proves nothing about the tenant check.
+    """
+    identity = Identity(
+        subject="agt-secrets-engine",
+        issuer="test",
+        audiences=("approval-engine",),
+        principal_type="service",
+        tenant=tenant,
+        roles=frozenset(),
+        scopes=frozenset({"approval:observe"}),
+        assurance={},
+        evidence_ref="test",
+    )
+    from approval_engine.api import App
+
+    app = App(engine, StaticTokenAuthenticator({"near": identity}))
+    status, body = call(app, "GET", "/v1/cadence", authorization="Bearer near")
+    assert status == 403, f"{tenant!r} was admitted as an alias"
+    assert body["error"] == "forbidden"
+
+
+def test_exact_sanctioned_tenant_is_admitted(engine):
+    """The other half of the pin: the exact spelling must actually work.
+
+    Without this, a bug that rejected every tenant would pass the near-miss test
+    above while denying the sanctioned caller too.
+    """
+    assert engine.tenant == "tenant:platform"
+    identity = Identity(
+        subject="agt-secrets-engine",
+        issuer="test",
+        audiences=("approval-engine",),
+        principal_type="service",
+        tenant="tenant:platform",
+        roles=frozenset(),
+        scopes=frozenset({"approval:observe"}),
+        assurance={},
+        evidence_ref="test",
+    )
+    from approval_engine.api import App
+
+    app = App(engine, StaticTokenAuthenticator({"exact": identity}))
+    status, _ = call(app, "GET", "/v1/cadence", authorization="Bearer exact")
+    assert status == 200
+
+
 def test_deny_all_default_does_not_mutate(engine):
     from approval_engine.api import App
 
@@ -225,7 +291,7 @@ def test_human_principal_cannot_consume(engine):
         issuer="test",
         audiences=("approval-engine",),
         principal_type="service",
-        tenant="platform",
+        tenant="tenant:platform",
         roles=frozenset(),
         scopes=frozenset(
             {"approval:create", "approval:approve", "approval:read", "approval:consume"}
@@ -238,7 +304,7 @@ def test_human_principal_cannot_consume(engine):
         issuer="test",
         audiences=("approval-engine",),
         principal_type="human",
-        tenant="platform",
+        tenant="tenant:platform",
         roles=frozenset(),
         scopes=frozenset({"approval:consume"}),
         assurance={"level": "aal2"},
diff --git a/tests/test_pep.py b/tests/test_pep.py
index f496fc6..5a2659c 100644
--- a/tests/test_pep.py
+++ b/tests/test_pep.py
@@ -185,7 +185,7 @@ def live_http(tmp_path):
         issuer="https://keycape.example",
         audiences=("approval-engine",),
         principal_type="service",
-        tenant="platform",
+        tenant="tenant:platform",
         roles=frozenset({"secrets-engine"}),
         scopes=frozenset(
             {
diff --git a/workplans/APPROVAL-WP-0002-production-readiness-and-consumer-adoption.md b/workplans/APPROVAL-WP-0002-production-readiness-and-consumer-adoption.md
index dba5265..795d6c7 100644
--- a/workplans/APPROVAL-WP-0002-production-readiness-and-consumer-adoption.md
+++ b/workplans/APPROVAL-WP-0002-production-readiness-and-consumer-adoption.md
@@ -90,6 +90,37 @@ the approval store. The registrations doc's stale issuer
 (`https://auth.netkingdom.local`) is corrected to the live
 `https://kc.coulomb.social` from `06544b0`. T01 stays `progress`.
 
+2026-09-06 resolution: the operator accepted `tenant:platform` as the platform
+management/administration/services tenant (landlord zone) — decision
+`5ed3fb35-eca9-413a-82b9-95171ba85bf6`,
+`glas-harness/docs/platform-tenant-decision.md`, relayed by `glas-harness`. The
+collision above is closed by setting the store tenant to exactly
+`tenant:platform`: `deploy/approval-engine.yaml` `--tenant`, the
+`approval_engine/cli.py` `--tenant` default, and the `Engine(tenant=…)` default
+all move off bare `platform`, and the requested client registrations now ask for
+`tenant: tenant:platform`. Exact JWT/store equality is retained — no alias, no
+normalisation, no prefix handling, and no implicit cross-tenant grant.
+
+Moving the *defaults* rather than only the manifest is deliberate: a default of
+`platform` under a sanctioned value of `tenant:platform` is a trap, because a
+`serve` that omits `--tenant` would come up healthy and then refuse every
+authenticated call.
+
+The default change broke ten tests whose identity fixtures hard-coded
+`platform`, which is the fixture-consistency hazard flex-auth reported as
+`FLEX-DEC-2026-008` (29 fixtures all carrying one tenant proved nothing about
+the field). Fixtures are aligned to the exact spelling, and the field is now
+*varied* rather than merely present:
+`tests/test_auth.py::test_near_miss_tenant_spellings_are_forbidden` refuses
+`platform`, `tenant:coulomb`, case variants, whitespace variants and empty
+against a `tenant:platform` store, and
+`test_exact_sanctioned_tenant_is_admitted` pins the other half so a
+reject-everything bug cannot pass. 111 tests pass.
+
+This resolves the choice of value only. T01 stays `progress`: KeyCape still has
+to own and prove these registrations, and credential materialization is
+unchanged.
+
 ## Harden durable storage and migrations
 
 ```task
@@ -138,6 +169,40 @@ read-only root, resources, probes, and default-deny policies pass client dry-run
 Waiting on release digest, KeyCape/audit registrations and credentials, rollout,
 restart, and restore evidence.
 
+2026-09-06 image preparation (GLAS-WP-0015 request; credential-independent half):
+built and validated locally against the agreed tenant and current schema.
+
+- Build: `make image-build` off the digest-pinned base
+  `python:3.12-slim@sha256:d764629c…`. Local manifest-list digest
+  `sha256:85e46ddf47b3ac0cdab620163a7b034027451dff286b63ecff6a2493d7a57ecc`.
+  **This is a local build digest, not a release digest** — the manifest still
+  carries `REPLACE_WITH_RELEASE_DIGEST` because pinning requires a push to
+  `forgejo.coulomb.social`, which needs registry credentials this session does
+  not hold.
+- Runtime identity: `uid=10001(approval) gid=10001(approval)`, non-root as
+  required.
+- Schema: image carries `LATEST_SCHEMA_VERSION = 3`, matching the migrated
+  store, and `Engine` tenant default `tenant:platform`.
+- First-install migration (no prior DB): `migrate` then `verify` on a fresh
+  volume both report `schema_version: 3`, `schema_current: true`,
+  `integrity: ["ok"]`, `foreign_key_violations: 0`, `persistent: true`.
+- Fail-closed configuration proven in the image, not only in tests:
+  `serve --production --db :memory:` refuses with "production requires a
+  persistent database"; `serve --production` on a real DB without audit
+  configuration refuses with "production requires authenticated audit
+  delivery".
+- Manifest inputs: `kubectl apply --dry-run=client` passes for the namespace,
+  service, and StatefulSet with the new `--tenant tenant:platform`.
+
+Scan gate NOT met: no scanner (`trivy`, `grype`, `docker scout`) is installed on
+this workstation, so no vulnerability scan was run and none is claimed. The
+inventory a scanner needs is the pinned base above plus
+`cryptography==50.0.1`, `PyJWT==2.13.0`, `waitress==3.0.2`, `cffi==2.1.1`,
+`pycparser==3.0`, `pip==25.0.1`.
+
+T03 stays `wait`: still no release digest, no KeyCape/audit credentials, no
+rollout, and no restart/restore evidence. Nothing here is a deploy.
+
 ## Wire outbox delivery and reconciliation
 
 ```task