chore: sync uv.lock to 0.2.7; ignore .claude/ local settings

- uv.lock: package version bumped 0.2.2 → 0.2.7 (was stale).
- .gitignore: exclude .claude/ (Claude Code per-user settings, not shared).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.gitignore

@@ -17,3 +17,6 @@ __pycache__/
 
 # Reference material (not part of this project's source)
 reference/
+
+# Claude Code local settings
+.claude/