Add committee meeting agenda skill

[ceejaymoss]

Summary

• New committee-agenda skill lets community members request agenda items via natural language (@Roo add to agenda: <topic>); Roo posts a structured Block Kit card to a dedicated #committee-agenda Slack channel.
• Slack is the source of truth — seconds are tallied via emoji reactions on the posted card.
• Committee admins (admin/committee/portfolio_lead roles) can close items with @Roo agenda complete in the item's thread, delete with @Roo remove agenda item, or bulk-clear completed items with @Roo agenda cleanup / @Roo remove completed agenda items.
• Deterministic routing patterns in content_intent.py mean these phrases match before the LLM fallback. 42/42 existing routing tests still pass.

Configuration

Add to .env:

• COMMITTEE_AGENDA_CHANNEL_ID — Slack channel ID for agenda posts (preferred), or
• COMMITTEE_AGENDA_CHANNEL_NAME — defaults to committee-agenda; resolved at runtime if the bot is a member.
• COMMITTEE_AGENDA_SECOND_EMOJI — defaults to +1.

The Slack bot needs channels:history, chat:write, and (if using channel-name resolution) membership in the agenda channel. Edits/deletes only work on messages Roo posted.

Test plan

• Set COMMITTEE_AGENDA_CHANNEL_ID and restart Roo.
• In any channel: @Roo add to agenda: budget for new whiteboards → card appears in #committee-agenda, confirmation reply links back.
• React :+1: on the card — confirm it counts as a second visually.
• As a committee admin, in the card's thread: @Roo agenda complete → header flips to "✅ Completed agenda item", thread reply confirms.
• As a committee admin, in the card's thread: @Roo remove agenda item → card deleted.
• As a committee admin: @Roo remove completed agenda items → all ✅ Completed cards in the channel are deleted, summary returned.
• As a non-admin: @Roo agenda complete → denial message, no state change.
• Confirm no regression in existing routing (content-factory, github-integration, linear-meeting-actions).

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