Merges the evaluator follow-up suggestion system (FN-3392, Steps 1–5), which adds a normalized contract, provenance tracking, and lifecycle documentation for AI-generated follow-up tasks, alongside chat UI improvements including unread indicators in header and mobile nav, corrected message routing,
Fusion-Task-Id: FN-3392
- Add eval score category types and exports in core with store support and coverage
- Implement engine evaluator evidence extraction and persistence with dedicated tests
- Update evaluator flow and cron wiring to record evidence alongside eval runs
- Refresh architecture, storage, and eval docs for evidence and categorization behavior
Fusion-Task-Id: FN-3391
Exported the eval score category type from `@fusion/core` and added a defensive guard in the evaluator to prevent edge-case failures in the score evaluation switch.
Fusion-Task-Id: FN-3390
Completes typing for the scheduled evaluator integration in the cron runner and project engine, with corresponding test updates in the evaluator test file.
Fusion-Task-Id: FN-3389
