feat(capability-registry): CUST-WP-0031 domain capability registry

- Migration p3k4l5m6n7o8: nullable repo_id FK on capability_catalog
- PATCH /capability-catalog/{id} endpoint for back-filling repo attribution
- register_capability MCP tool accepts optional repo_slug
- get_domain_summary now includes compact capabilities list (type+title+repo_slug)
- New get_capability_profile MCP tool: domain → repos → capabilities tree
- 6 repo descriptions populated; 25 catalog entries attributed to repos
- 9 new capabilities registered for personhood, foerster_capabilities, coulomb_social
- TOOLS.md: Capability Catalog & Requests section with full tool reference

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

workplans/CUST-WP-0031-capability-registry.md

@@ -4,7 +4,7 @@ type: workplan
 title: "Domain Capability Registry"
 domain: custodian
 repo: the-custodian
-status: active
+status: done
 owner: custodian
 topic_slug: custodian
 created: "2026-03-31"
@@ -81,7 +81,7 @@ existing catalog entries; register capabilities for the three empty domains.
 ```task
 id: T01
 title: "Add repo_id FK to CapabilityCatalog"
-status: todo
+status: done
 priority: high
 description: >
   1. Write Alembic migration: add `repo_id` UUID nullable FK column to
@@ -103,7 +103,7 @@ state_hub_task_id: "8d5e3e37-c753-4cdc-9211-83ee39f6b0f2"
 ```task
 id: T02
 title: "Include compact capabilities in get_domain_summary"
-status: todo
+status: done
 priority: high
 description: >
   Extend the `get_domain_summary` MCP tool response to include a
@@ -122,7 +122,7 @@ state_hub_task_id: "ac47994c-efe9-404f-8065-9adf2e923d4c"
 ```task
 id: T03
 title: "New MCP tool: get_capability_profile"
-status: todo
+status: done
 priority: high
 description: >
   Add a new MCP tool `get_capability_profile(domain_slug: str | None = None)`
@@ -159,7 +159,7 @@ state_hub_task_id: "b380fd2b-28fa-4c47-96d6-4c65a0300c44"
 ```task
 id: T04
 title: "Populate missing repo descriptions"
-status: todo
+status: done
 priority: medium
 description: >
   Use PATCH /repos/{slug}/ to set `description` for the 8 repos that
@@ -184,7 +184,7 @@ state_hub_task_id: "00d44110-fcb4-45cc-8bc8-454af2629d2f"
 ```task
 id: T05
 title: "Back-fill repo_id on existing capability catalog entries"
-status: todo
+status: done
 priority: medium
 description: >
   After T01 lands, update the 25 existing catalog entries to set repo_id
@@ -221,7 +221,7 @@ state_hub_task_id: "7f0748c7-bdee-4801-b870-d4940a5a2e63"
 ```task
 id: T06
 title: "Register capabilities for personhood, foerster_capabilities, coulomb_social"
-status: todo
+status: done
 priority: medium
 description: >
   Register at least 3 capabilities per missing domain using
@@ -250,7 +250,7 @@ state_hub_task_id: "c6e1be52-961c-4e34-96b1-e450d64298df"
 ```task
 id: T07
 title: "Consistency gate and smoke test"
-status: todo
+status: done
 priority: low
 description: >
   1. Run `make test` — all existing tests must pass.