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>

scripts/project_rules/agents.template

@@ -0,0 +1,20 @@
+## Kaizen Agents
+
+Specialized agent personas available on demand via the state-hub MCP.
+
+**Discover:** `list_kaizen_agents()` — returns all agents with name, description, category
+**Load:** `get_kaizen_agent("tdd-workflow")` — returns full instructions; read and follow them
+
+Common agents:
+
+| Agent | Category | When to use |
+|-------|----------|-------------|
+| `tdd-workflow` | testing | Step-by-step TDD8 workflow for any feature |
+| `code-refactoring` | quality | Code quality analysis and safe refactoring |
+| `test-maintenance` | testing | Diagnose and fix failing tests |
+| `requirements-engineering` | process | Prevent interface/mock mismatches upfront |
+| `keepaTodofile` | process | Maintain TODO.md during work |
+| `project-management` | process | Track status, determine next steps |
+| `datamodel-optimization` | quality | Optimize dataclasses and data structures |
+
+All 17 agents: call `list_kaizen_agents()` for the full list.

scripts/project_rules/claude-md.template

@@ -7,3 +7,4 @@
 @.claude/rules/stack-and-commands.md
 @.claude/rules/architecture.md
 @.claude/rules/repo-boundary.md
+@.claude/rules/agents.md