refactor: consolidate skill docs, add anti-drift tests, and apply audit fixes

DLO-13: Restructure vlm-library-workflow skill as safety contract layer.
- Rewrite SKILL.md (69 lines): safety contract, execution threshold semantics,
  six-step high-risk loop, decision rules, phase skeleton
- Delete redundant references (cli-reference, workflow, command-recipes, dev-guide)
- Add triage.md (failure mapping + preflight) and dev-map.md (module→test mapping)
- Add tests/test_docs_consistency.py: 78 parametrized tests verifying documented
  vlm commands exist in CLI registry
- Add CSV path mismatch test to test_plan_review.py (4th safety gate path)
- Delete vlm-expert.skill (Gemini package, 7 months stale) and README Gemini section

DLO-2 audit fixes: rate limiter injection, symmetric quarantine categories,
review-plan safety gates, parser improvements, planner validation.

CLI modularization: commands/ directory with one module per command group.

tests/test_cli_quarantine.py

@@ -177,24 +177,24 @@ class TestQuarantineAddCommand:
         assert "Reason: duplicate file" in result.output
         assert "successfully quarantined" in result.output
     
-    def test_add_anime_file_rejected(self, config_file, temp_library):
-        """Test that anime files are rejected."""
+    def test_add_anime_file_supported(self, config_file, temp_library):
+        """Test that anime files can be quarantined (configured category)."""
         runner = CliRunner()
         
         # Create a test anime file
         anime_file = temp_library / "anime" / "Anime Show.mkv"
         anime_file.write_text("anime content")
         
-        # Try to quarantine (should fail)
+        # Quarantine should succeed
         result = runner.invoke(main, [
             '--config', str(config_file),
             'quarantine', 'add',
             str(anime_file)
         ])
         
-        assert result.exit_code == 1
-        assert "not supported" in result.output.lower()
-        assert anime_file.exists()  # File should still exist
+        assert result.exit_code == 0
+        assert "successfully quarantined" in result.output
+        assert not anime_file.exists()
     
     def test_add_nonexistent_file(self, config_file, temp_library):
         """Test adding a file that doesn't exist."""