- main.py: detect rate_limit_exhausted from voter_a, switch to single(voter_b)
and notify Discord once per session
- discord.py: add notify_voter_fallback() with yellow warning embed
- config.py: add voter_fallback to default notify_on list
- dashboard/app.py: show warning banner when fallback mode active (last 2h)
- CLAUDE.md: refresh architecture docs, fix stale google-genai migration note
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
