A community based topic aggregation platform built on atproto

docs: add OAuth DPoP architecture analysis and feed system docs master

- Document P0 blocker: DPoP token write-forward architecture issue - Analyze correct client-direct-write pattern (following Bluesky) - Add feed system implementation documentation - Clean up CLAUDE.md whitespace 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>