chore: gitignore .claude/settings.local.json (#38)

Per-machine Claude Code settings should not be committed.

Author: tngotr

.gitignore

@@ -11,3 +11,6 @@ build/
 .mypy_cache/
 *.egg
 .coverage
+
+# Claude Code local settings (per-machine, not committed)
+.claude/settings.local.json