Close HUB-WP-0009 conformance gaps (C2, C7, C9, C10); mark blocked workplans

Implements the four residual conformance checks left open by the T04
minimal vertical:

- C2: GET /ports/registry/registrations/{hub_slug} resolves missing (404),
  ambiguous (shared reuse_surface_id across hub_slugs), and stale
  (deprecated/retired descriptor) registrations; a new .../audit route
  exposes queryable registration history from the existing in-memory
  history and the PostgreSQL runtime_audit_ledger.
- C7: harness proof that disabled compatibility groups deny access
  (404) with no fixture credentials involved, matching the existing
  fail-closed compat router behavior.
- C9: harness proof plus a dedicated test that /readyz degrades only on
  an unavailable configured dependency while unrelated disabled
  projections stay non-blocking.
- C10: ContractValidator now negotiates contract_version_min/max against
  the runtime's contract version and rejects incompatible or inverted
  ranges with an explicit 422 instead of silently accepting them.

HUB-WP-0009 is now finished. HUB-WP-0006 is marked blocked: its only open
task (T06) has no remaining hub-core code path and waits on an external
Forgejo identity/production deployment gate. HUB-WP-0011 is marked
blocked: T02/T03 already waited on external credential/deployment
review, and T01 needs a source/destination ownership and retention
decision against live message data before it can be implemented safely.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

Assistant: claude-code
Assistant-Model: sonnet
Assistant-Process: 310936@bnt-lap001
Assistant-Session: 00cd9abe-09a0-416b-88e0-f907b9101629

workplans/HUB-WP-0006-repository-classification-navigation.md

@@ -4,7 +4,7 @@ type: workplan
 title: "Repository classification aggregation and navigation"
 domain: infotech
 repo: hub-core
-status: active
+status: blocked
 flavor: implementation
 owner: codex
 topic_slug: custodian
@@ -190,6 +190,14 @@ directory or restoring State Hub as the classification authority. Once a
 scoped publisher endpoint is deployed and the candidate migration/image is
 rolled out, comparison and `RM_SLICE_TOPICSPINE` can proceed.
 
+Loose-ends review 2026-09-27: T01-T05 remain the only work owned by this repo,
+and all five are `done`. T06 has no remaining hub-core code path — it is
+waiting on `RAPPCOREHUB-WP-0003-T04` (a dedicated `read:repository` Forgejo
+identity plus an error-free 123-repository admission proof) and production
+placement/networking outside this repository. Marking the workplan `blocked`
+rather than `active` since nothing further can move here until that external
+gate closes.
+
 ## Acceptance
 
 - [x] Repo Manager v1.0 authority and projection contract accepted