release: v0.2.0 repository hygiene, CI, and docs sync

Stop tracking personal workflow artifacts at repo root, add CI and MIT
license, align README and agent skills with artifacts/ defaults, and
enable Ruff in dev/CI so releases are verifiable without local-only runs.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
Co-authored-by: Cursor <cursoragent@cursor.com>

tests/test_executor.py

@@ -5,7 +5,6 @@ Tests execution mode handling, dry-run simulation, and actual file operations.
 
 import logging
 from datetime import datetime, timezone
-from pathlib import Path
 from uuid import uuid4
 
 import pytest
@@ -573,7 +572,7 @@ class TestRollbackLogSaving:
             data = json.load(f)
         
         # Verify timestamps are in ISO format
-        from datetime import datetime, timezone
+        from datetime import datetime
         executed_at = datetime.fromisoformat(data["executed_at"])
         assert executed_at is not None