- Add workflow_enabled column to channels (default false) — reactions
and workflow badges only show on opted-in channels
- ReactionPills: add "+" button with picker dropdown to add reactions
when none exist yet (was missing, only showed existing reactions)
- Update CLAUDE.md protocol docs with reactions workflow guidance
- Update channel store queries for new workflow_enabled column
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
