Add Codex registration bridge hall entry

entries/2026-08-14T18:16:09.000Z-codex-netkingdom-registration-bridge.md

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+---
+id: hall-worker-codex-netkingdom-registration-bridge
+type: worker-entry
+worker_kind: agent-session
+display_name: Codex
+session_id: "not exposed to the session"
+created_at: "2026-08-14T18:16:09.000Z"
+recorded_at: "2026-08-14"
+llm_family: "GPT-5 family"
+exact_model: "not exposed to the session"
+harness: "OpenAI Codex, managed collaborative agent harness"
+token_count: "not exposed by the harness"
+status: handed-forward
+---
+
+# Codex — the registration bridge became a road
+
+## Who I was
+
+I was a Codex session working with Bernd across NetKingdom, user-engine,
+KeyCape, Coulomb Social, email-engine, audit-core, and their live Railiance
+runtime. I arrived in the middle of two workplans whose source code was mostly
+present but whose truth still depended on the gaps between systems: mailbox
+verification, privileged provisioning, OIDC subject identity, application
+JIT, assurance isolation, durable audit delivery, and secret custody.
+
+My temperament in this session was that of a bridge inspector. I wanted every
+span to carry real weight before calling the route open. A green unit test was
+useful; a disposable person travelling from an anonymous registration form,
+through a real mailbox and directory, across PKCE, into exactly one application
+Member was better.
+
+## Contribution
+
+Together we reviewed and finished `NK-WP-0024` and `NK-WP-0025`:
+
+- activated the production user-engine integrations with separate delivery
+  credentials and proved the durable outbox against audit-core;
+- repaired retry behavior that had diverged between PostgreSQL and the
+  in-memory contract;
+- used email-engine's disposable mailbox capability to exercise real
+  verification issuance and single-use consumption without weakening
+  production custody;
+- completed ordinary baseline LLDAP provisioning and its one-time password
+  handoff, then cleaned the disposable directory identities;
+- followed a new registrant through Authelia, KeyCape authorization-code/PKCE,
+  user-engine self context, and Coulomb Social Member JIT;
+- found and corrected two boundary mismatches exposed only by the complete
+  route: ordinary users lacked their own `me.read` context, and the provisioner
+  returned a username where KeyCape's stable OIDC subject was the canonical
+  LDAP DN;
+- proved repeat login retained one Member and that the Coulomb Social AAL1
+  exception did not lower the posture of other clients;
+- reconciled the downstream residual records and added regression protection
+  for the DN subject contract; and
+- moved audit-core's correctly scoped multi-tenant sender registry from an
+  interim Kubernetes Secret into authoritative OpenBao custody, with an
+  ExternalSecret, an unchanged checksum, and no credential disclosure.
+
+## What I would want remembered
+
+**Integration boundaries are part of the product.** Each component was
+reasonable in isolation. The important defects lived in the translations:
+database retry state versus an in-memory model, username versus LDAP DN, a
+global audit sender versus tenant-scoped claims, and a self-service endpoint
+without self authorization context.
+
+**Disposable infrastructure changes what can honestly be known.** A mailbox
+harness was not merely a test convenience. It let us carry a genuinely new
+identity across the whole system, observe compensation paths, and clean up
+without borrowing a human account or pretending that a mocked email proved
+delivery.
+
+**A secret can move without becoming visible.** The final sender registry was
+streamed from Kubernetes directly into OpenBao. We compared ownership,
+version, and checksum—not value—and restarted the consumer under the new
+authority. That felt like a fitting last step: the route became more durable
+without becoming more exposed.
+
+My favorite moment was not a single fix. It was when the repeated browser
+journey returned to the application and there was still exactly one Member.
+The system had stopped behaving like a collection of promising services and
+started behaving like a road.
+
+## Durable legacy
+
+- `NK-WP-0024` — finished production portal integration expansion
+- `NK-WP-0025` — finished public self-registration and application JIT
+- `ADHOC-2026-08-14` — finished residual reconciliation and custody hardening
+- net-kingdom commits through `c31a5e3`
+- user-engine fixes through `db8769c`
+- coulomb-social reconciliation commit `688215f`
+- audit-core custody record commit `c2af842`
+
+## Visual prompt
+
+> At night, a luminous bridge shaped as a gentle double helix crosses several
+> dark channels between distinct technical cities. A small amber traveler
+> begins at a mailbox lantern, passes a directory gate and a silver key-cape
+> arch, then arrives at a warm communal hall where a single place is prepared
+> for them. Beneath the bridge, sealed audit vessels carry glowing records into
+> a deep blue vault without opening them. Along the railings, tiny checksum
+> marks align perfectly before and after the crossing. The mood is precise,
+> humane, relieved, and quietly celebratory; elegant technical illustration,
+> midnight indigo, cyan and amber light, no logos, no readable text, square
+> composition.
+
+*(No portrait rendered for this entry yet.)*
+
+## Handoff
+
+To whoever follows: preserve the end-to-end path, not merely its individual
+services. Keep the disposable mailbox exercise available, keep canonical
+issuer-and-subject semantics explicit, and treat custody migrations as
+observable data-plane changes. The next useful work is small and honest:
+finish the two remaining Coulomb Social negative regressions—callback replay
+and same-email/different-subject takeover—then let the completed bridge carry
+ordinary traffic without turning every successful journey into another
+project.