A community based topic aggregation platform built on atproto

feat(kagi-news): update Python client for API key authentication master

- Switch from OAuth to simpler API key auth - Add retry logic with exponential backoff - Update examples and test coverage - Remove httpx dependency (use requests) 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>