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/session-protocol.md

@@ -43,7 +43,7 @@ For each file with `status: ready`, `active`, or `blocked`, note pending
 
 **Step 4 — Present brief**
 
-1. **Active workstreams** for `custodian` — title, task counts, blocking decisions
+1. **Active workplans** for this repo — title, task counts, blocking decisions
 2. **Pending tasks** from `workplans/` + any `[repo:state-hub]` hub tasks
 3. **Goal guidance** — if `goal_guidance` in summary:
    - `needs_workplan`: surface as top action — *"Repo goal '{title}' has no workplan yet"*
@@ -51,12 +51,13 @@ For each file with `status: ready`, `active`, or `blocked`, note pending
 4. **Suggested next action** — highest-priority open item
 5. **SBOM status** — flag if `last_sbom_at` is unset for this repo
 
-If no workstreams: follow First Session Protocol (`first-session.md`).
+If no workplans: follow First Session Protocol (`first-session.md`).
 
 **During work:** `record_decision()` · `add_progress_event()` · `resolve_decision()`
 
-> State Hub is a *read model*. Bootstrap tools (`create_workstream`, `create_task`)
+> State Hub is a *read model*. Bootstrap tools (`create_workplan`, `create_task`)
 > are First Session Protocol only. Work structure belongs in repo files (ADR-001).
+> Repo registration uses `.repo-classification.yaml` via `register_repo_from_classification`.
 
 **Session close:**
 With MCP tools: