chore: gitignore .claude/scheduled_tasks.lock

Claude Code writes a local scheduled-task lock under .claude/ next to the
tracked settings.json. Ignore it so it stops surfacing in git status and can't
be swept into a `git add -A`. Targeted entry — settings.json stays tracked.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: max-parke-scale

.gitignore

@@ -18,4 +18,7 @@ Brewfile.lock.json
 .DS_Store
 
 # Claude workspace directories
-.claude-workspace/
+.claude-workspace/
+
+# Claude Code local scheduled-task lock
+.claude/scheduled_tasks.lock