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>

api/schemas/capability_request.py

@@ -14,6 +14,14 @@ class CatalogCreate(BaseModel):
     title: str
     description: str | None = None
     keywords: list[str] = []
+    repo_slug: str | None = None  # optional repo attribution
+
+
+class CatalogPatch(BaseModel):
+    repo_slug: str | None = None
+    description: str | None = None
+    keywords: list[str] | None = None
+    status: str | None = None
 
 
 class CatalogRead(BaseModel):
@@ -21,6 +29,8 @@ class CatalogRead(BaseModel):
 
     id: uuid.UUID
     domain_slug: str
+    repo_id: uuid.UUID | None = None
+    repo_slug: str | None = None
     capability_type: str
     title: str
     description: str | None = None