feat(classification-spine): implement STATE-WP-0065 repo-anchored model

Replace the ad-hoc coordination-domain spine with the Repo Classification
Standard: 14 market domains, classification columns on managed_repos, and
workplans anchored by repo_id (topic_id optional).

- Add Alembic migration d8e9f0a1b2c3 with data backfill and workstream→workplan rename
- Add api/classification.py validation and register-from-classification tooling
- Expose workplan-first REST/MCP surface with legacy workstream aliases
- Add C-24 consistency rule and legacy domain frontmatter mapping
- Update dashboard repos page with category/capability/stake filters
- Update orientation docs; mark STATE-WP-0065 finished

.claude/rules/repo-identity.md

@@ -1,5 +1,8 @@
 **Purpose:** Standalone State Hub service repository extracted from the-custodian/state-hub. Owns the FastAPI API, MCP server, dashboard, migrations, consistency tooling, and operational docs.
 
-**Domain:** custodian
+**Classification:** tooling · infotech (see `.repo-classification.yaml`)
 **Repo slug:** state-hub
-**Topic ID:** cee7bedf-2b48-46ef-8601-006474f2ad7a
+**Topic ID:** cee7bedf-2b48-46ef-8601-006474f2ad7a *(legacy optional tag)*
+
+Coordination spine is **repo-anchored** — workplans bind to `repo_id`, market
+domain is derived from classification, not from the old coordination-domain model.