chore: gitignore .claude/scheduled_tasks.lock

A Claude Code harness artifact that was showing up as untracked.

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

.gitignore

@@ -39,6 +39,7 @@ npm-debug.log*
 
 # Local Claude settings
 .claude/settings.local.json
+.claude/scheduled_tasks.lock
 
 # Parallels Windows VM SSH/connection config (local machine, see CLAUDE.md)
 .parallels