docs(plan): check off completed Phase 4-7 items
Updated plan.md Implementation Phases checklist to reflect completed
features in Phases 4-7 that were verified implemented in code but not
yet checked off.
Completed items now marked:
- Phase 4 (all 5): Cross-reference hyperlinking, inline diff view,
file activity heatmap, cost & token tracking, conversation transcript
- Phase 5 (all 5): Stuck detection, loop detection, worker collision,
smart error grouping, semantic activity narrative
- Phase 6 (3 of 4): Git integration, AI session digest, historical
session index; worker comparison analytics web layer remains (bf-4cqq)
- Phase 7 (all 5): Session replay, task DAG, budget alerts, anomaly
detection, recovery playbook
Updated status line to reflect Phase 6 has one remaining gap.
Closes: bf-ozsu
08b1b5a473