- Add HardBlock variant to WatcherEvent (story_id, agent_name, reset_time)
- In pty.rs, distinguish allowed_warning (throttle) from hard blocks;
emit RateLimitWarning for throttles, HardBlock for actual 429s
- Add `throttled: bool` field to StoryAgent / AgentInfo
- Pool spawns a background listener that sets throttled=true on
RateLimitWarning or HardBlock events and fires AgentStateChanged
- Status command shows traffic-light dots: ○ idle, ● running, ◑ throttled, ✗ blocked
- Read blocked flag from story front matter for the ✗ dot
- Notifications: RateLimitWarning silenced (too noisy); HardBlock sends
urgent chat notification with optional reset time
- Tests added for traffic_light_dot, read_story_blocked, status output,
and all notification paths
dave