feat(423): auto-schedule timer on rate limit to resume after reset
- pty.rs: detect rate_limit_event hard blocks, parse reset_at, emit
WatcherEvent::RateLimitHardBlock with story_id, agent_name, reset_at
- watcher.rs: add RateLimitHardBlock variant to WatcherEvent enum
- timer.rs: add TimerStore::upsert (add-or-update-to-later) and
spawn_rate_limit_auto_scheduler (listens for RateLimitHardBlock,
upserts timer for the blocked story)
- notifications.rs: handle RateLimitHardBlock events with a debounced
chat notification including the scheduled resume time;
add format_rate_limit_hard_block_notification helper
- matrix/mod.rs: subscribe second watcher_rx for auto-scheduler,
pass it to run_bot
- matrix/bot/run.rs: wire spawn_rate_limit_auto_scheduler into bot startup
Tests cover: AC1 (hard block detection in pty), AC2 (auto-scheduler
adds timer), AC3 (upsert deduplication), AC5 (chat notification sent),
AC6 (worktree preserved — timer fires start_agent on existing worktree)
dave
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