add feed consumption, following, and owner-gating
- read_timeline, read_feed, follow_user tools in agent.py
- owner-gate create_feed and follow_user (via settings.owner_handle)
- BotClient methods for timeline, feed, follow, get_following
- 6 new evals for feed consumption + permission checks
- fix test_graze_tools_registered (deprecated pydantic-ai API)
- include previously uncommitted graze client + feed creation evals
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>