chore: ignore .claude/ local settings dir

Claude Code writes per-project permission settings here; harmless to
track but noisy across sessions. Gitignoring keeps the release
pre-flight check happy.

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

.gitignore

@@ -58,6 +58,9 @@ Thumbs.db
 *.swp
 *.swo
 
+# Claude Code per-project local settings
+.claude/
+
 # Coverage
 coverage/
 *.lcov