Adds title/cab_joined_date/slug to users, extends attendance with kind enum
and 'interested' status, and creates pulses, votes, roadmap_items,
roadmap_attributions, events, and activity tables.
Slug backfill covers the three seed users; new-user slug generation will
live in db.ts. roadmap_items has shipped_at to drive the council mark
(simpler than an audit table). roadmap_attributions is admin-curated only.
Also logs the pre-existing /api/contributions/[id]/edit 302-only bug in
KNOWN_ISSUES.md so it isn't lost; out of scope for this work.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
