feat: agent authoring & doc generation (WP-0007, v1.4.0)

New authoring tooling and a fix for the doc-regeneration defect it exposed.

Added:
- src/kaizen_agentic/agent_docs.py — render + idempotent upsert of the
  CLAUDE.md "## Installed Agents" section (shared by installer and CLI)
- `kaizen-agentic docs generate [--check]` — idempotent doc refresh / CI gate
- `kaizen-agentic create-agent` — scaffold a schema-valid agent
- Frontmatter schema validation in `kaizen-agentic validate`
  (required name/description/category, known category, valid memory/model)
- tests: test_agent_docs, test_validate_schema, test_create_agent

Fixed:
- _update_documentation regex duplicated the Installed Agents block on every
  run (stopped at the first ### subheading) — now idempotent
- declared frontmatter `category` is authoritative (heuristic is fallback)
- list_installed_agents reads the frontmatter name, not the filename
- renamed agent-project-management.md -> agent-project-assistant.md to satisfy
  the agent-<name>.md convention (eliminates a name/filename collision that
  caused install/update to write a divergent duplicate)
- test_cli_error_handling no longer installs into the repo root (uses tmp)

Version 1.4.0; CHANGELOG, CLI cheat sheet, agency-framework, TODO updated.
Workplan KAIZEN-WP-0007 closed.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

.claude/rules/architecture.md

@@ -17,7 +17,7 @@ Packaged copies live in `src/kaizen_agentic/data/agents/` for `pip install` dist
 |----------|--------|
 | Testing | `tdd-workflow`, `test-maintenance`, `testing-efficiency` |
 | Quality | `code-refactoring`, `datamodel-optimization` |
-| Process | `requirements-engineering`, `keepaTodofile`, `keepaChangelog`, `keepaContributingfile`, `project-management`, `priority-evaluation`, `scope-analyst` |
+| Process | `requirements-engineering`, `keepaTodofile`, `keepaChangelog`, `keepaContributingfile`, `project-assistant`, `priority-evaluation`, `scope-analyst` |
 | Infrastructure | `setupRepository`, `tooling-optimization`, `sys-medic` |
 | Release | `releaseManager` |
 | Docs | `claude-documentation` |