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>

tests/test_cli_error_handling.py

@@ -40,10 +40,15 @@ class TestClickWorkaround:
                     assert "Got unexpected extra argument" not in stdout_content
                     assert "Got unexpected extra argument" not in stderr_content
 
-    def test_update_command_error_suppression(self):
+    def test_update_command_error_suppression(self, tmp_path):
         """Test that spurious 'unexpected extra argument' errors are suppressed for update commands."""
+        # Seed a temp project so `update` does not rewrite the repo's own agents/
+        (tmp_path / "agents").mkdir()
+        (tmp_path / "agents" / "agent-tdd-workflow.md").write_text(
+            "---\nname: tdd-workflow\ndescription: d\ncategory: testing\n---\nx\n"
+        )
         # Test the update command that also shows spurious errors
-        with patch("sys.argv", ["kaizen-agentic", "update"]):
+        with patch("sys.argv", ["kaizen-agentic", "update", "--target", str(tmp_path)]):
             with patch("sys.stdout", new_callable=StringIO) as mock_stdout:
                 with patch("sys.stderr", new_callable=StringIO) as mock_stderr:
                     try:
@@ -116,9 +121,12 @@ class TestClickWorkaround:
 class TestInstallCommandSpecifics:
     """Test specific install command scenarios."""
 
-    def test_install_with_valid_agent(self):
+    def test_install_with_valid_agent(self, tmp_path):
         """Test install command with a valid agent name."""
-        with patch("sys.argv", ["kaizen-agentic", "install", "tdd-workflow"]):
+        with patch(
+            "sys.argv",
+            ["kaizen-agentic", "install", "tdd-workflow", "--target", str(tmp_path)],
+        ):
             with patch("sys.stdout", new_callable=StringIO) as mock_stdout:
                 with patch("sys.stderr", new_callable=StringIO) as mock_stderr:
                     try: