Stop tracking transient ScheduleWakeup lock

.claude/scheduled_tasks.lock is a runtime lock written by Claude Code's
ScheduleWakeup tool. It slipped into the previous commit; remove from
tracking and gitignore.

Author: kinncj

.claude/scheduled_tasks.lock

@@ -29,4 +29,5 @@ sandbox/
 # ── per-CLI local agent state — not source code, can vary per-machine ────────
 .claude/settings.local.json
 .claude/state/
+.claude/scheduled_tasks.lock
 .opencode/state/