add readme with architecture diagram, cleanup dead code
- add readme.md with ASCII architecture diagram in details block
- remove jetstream connection (vestige from pre-tap architecture)
- remove loadUserVotes and poll.votes Map (unused)
- add [src] link to tangled in header
- add .wrangler to gitignore
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>