- Extend `WatcherEvent` to an enum with `WorkItem` and `ConfigChanged` variants
so the watcher can distinguish between pipeline-file changes and config changes
- Watch `.story_kit/project.toml` at the project root (ignoring worktree copies)
and broadcast `WatcherEvent::ConfigChanged` on modification
- Forward `agent_config_changed` WebSocket message to connected clients; skip
pipeline state refresh for config-only events
- Add `is_config_file()` helper with unit tests covering root vs. worktree paths
- Accept `configVersion` prop in `AgentPanel` and re-fetch the agent roster
whenever it increments
- Increment `agentConfigVersion` in `Chat` on receipt of `agent_config_changed`
WS event via new `onAgentConfigChanged` handler in `ChatWebSocket`
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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