chore: remove transitive dependencies from explicit declarations
removes httpx and websockets from pyproject.toml as they are not directly imported and are provided transitively by atproto/fastmcp.
dependencies reduced from 11 to 9:
- anthropic, atproto, fastapi, fastmcp, openai, pydantic-ai, pydantic-settings, rich, turbopuffer, uvicorn
verified: bot still runs correctly, all HTTP operations working via transitive deps
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>