Add homepage posts display and dev improvements
- Display posts on homepage with author profiles
- Add click-to-copy DID on avatar (dev mode only)
- Remove description field from submit form (keep lexicon flexible)
- Fix AT Data Model undefined value issue in post records
- Add tmux dev server instructions to CLAUDE.md
- Update page tests for new posts display
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>