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_utils.py

@@ -1,10 +1,7 @@
 """Tests for utility functions."""
 
-import tempfile
 from pathlib import Path
 
-import pytest
-
 from vlm.utils import canonical_path, canonical_path_str, format_size, utc_now