feat(CUST-WP-0016): kaizen-agentic integration — MCP tools, templates, direct install

- Fix /domains/{slug}/ 500: EP/TD queries now use domain_id FK (not string column)
- Remove dead cascade-slug code in rename_domain (FK handles it)
- MCP: list_kaizen_agents(category?) + get_kaizen_agent(name) via resolve_repo_path()
- TOOLS.md: Kaizen Agents section with discovery/load pattern
- agents.template: new project rule for consumer repos
- claude-md.template + register_project.sh: include agents.md in new-project scaffolding
- agents/: direct install of 6 curated agents for hub sessions

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

api/routers/domains.py

@@ -73,16 +73,16 @@ async def get_domain(
         )
         ws_count = ws_count_row.scalar_one()
 
-    # Count EPs and TDs (domain is a string column there)
+    # Count EPs and TDs
     ep_count_row = await session.execute(
         select(func.count()).select_from(ExtensionPoint)
-        .where(ExtensionPoint.domain == slug)
+        .where(ExtensionPoint.domain_id == domain.id)
     )
     ep_count = ep_count_row.scalar_one()
 
     td_count_row = await session.execute(
         select(func.count()).select_from(TechnicalDebt)
-        .where(TechnicalDebt.domain == slug)
+        .where(TechnicalDebt.domain_id == domain.id)
     )
     td_count = td_count_row.scalar_one()
 
@@ -127,19 +127,6 @@ async def rename_domain(
     domain.slug = body.new_slug
     domain.name = body.new_name
 
-    # Cascade slug rename to EP/TD string columns
-    if old_slug != body.new_slug:
-        await session.execute(
-            ExtensionPoint.__table__.update()
-            .where(ExtensionPoint.domain == old_slug)
-            .values(domain=body.new_slug)
-        )
-        await session.execute(
-            TechnicalDebt.__table__.update()
-            .where(TechnicalDebt.domain == old_slug)
-            .values(domain=body.new_slug)
-        )
-
     await session.commit()
     await session.refresh(domain)
     return domain