Normalize agent instructions and workplan frontmatter (STATE-WP-0067)

- Align agent files with on-disk workplan prefixes (infer from workplan ids)
- Set workplan domain to registered domain_slug; add topic_slug where applicable
- Repair frontmatter delimiter formatting; migrate legacy task status literals
- Regenerate AGENTS.md, CLAUDE.md, and .claude/rules from State Hub templates

.claude/rules/repo-boundary.md

@@ -2,7 +2,7 @@
 
 This repo owns **kaizen-agentic** only. It does not own:
 
-- State-hub MCP integration code → `the-custodian/state-hub/mcp_server/server.py`
-- Agent discovery tools (`list_kaizen_agents`, `get_kaizen_agent`) → `the-custodian`
-- Custodian coordination and workplan tracking → `the-custodian`
-- Deployment to custodiancore → `ops-bridge`
+<!-- TODO: List what belongs in adjacent repos, e.g.:
+- SSH key management → railiance-infra/
+- State hub code     → state-hub/
+-->