chore: ignore .claude/launch.json (local preview config)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

.gitignore

@@ -32,3 +32,6 @@ build-dir/
 # Python bytecode
 __pycache__/
 *.pyc
+
+# Claude Code local preview/dev-server config
+.claude/launch.json