chore(git): ignore .claude/ local state

The directory carries this session's scheduled-tasks lock file and
agent-memory cache; both are per-user state, not project artifacts.
Stops `git status` from listing it on every command.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

.gitignore

@@ -1,6 +1,9 @@
 .DS_Store
 Thumbs.db
 
+# Claude Code local state — agent memory, scheduler lock, etc.
+.claude/
+
 # mcp-server (TypeScript)
 mcp-server/node_modules/
 mcp-server/dist/