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/models/capability_catalog.py

@@ -22,6 +22,12 @@ class CapabilityCatalog(Base, TimestampMixin):
         nullable=False,
         index=True,
     )
+    repo_id: Mapped[uuid.UUID | None] = mapped_column(
+        UUID(as_uuid=True),
+        ForeignKey("managed_repos.id", ondelete="SET NULL"),
+        nullable=True,
+        index=True,
+    )
     capability_type: Mapped[str] = mapped_column(String(50), nullable=False)
     title: Mapped[str] = mapped_column(String(255), nullable=False)
     description: Mapped[str | None] = mapped_column(Text, nullable=True)
@@ -33,7 +39,12 @@ class CapabilityCatalog(Base, TimestampMixin):
     )
 
     domain: Mapped["Domain"] = relationship("Domain", lazy="selectin")  # noqa: F821
+    repo: Mapped["ManagedRepo | None"] = relationship("ManagedRepo", lazy="selectin")  # noqa: F821
 
     @property
     def domain_slug(self) -> str:
         return self.domain.slug if self.domain is not None else ""
+
+    @property
+    def repo_slug(self) -> str | None:
+        return self.repo.slug if self.repo is not None else None