v0.3.0

What's Changed

• Dev by @mous222 in #13

The v1 redesign of the Cominty Python SDK: a cleaner public surface, a broader
supported-Python range, and typed streaming and error handling throughout.

⚠️ Breaking changes

• Renamed public response models — dropped the Out suffix:
  • ThreadOut → Thread, ThreadSummaryOut → ThreadSummary
  • MessageOut → Message
  • AgentOut → Agent
  • ConversationFileOut → ConversationFile
• AsyncHTTPClient → AsyncTransport
• ThreadUpdate → UpdateThreadParams
• New module layout (models, streaming, and transport split into their own
  modules) — update your imports accordingly.

✨ Highlights

• Wider Python support: 3.9+ (was 3.11+). Installs and runs on 3.9 through
  3.13, verified across the full matrix in CI.
• StreamHandle[EventT] — typed, public primitive for consuming chat event
  streams.
• Typed error bodies — APIError.error now carries a structured
  APIErrorBody model instead of a raw dict.
• Explicit __all__ across modules for a clean, intentional public API.
  APIErrorBody model instead of a raw dict.
• Explicit __all__ across modules for a clean, intentional public API.
• Fully typed (pyright strict) and py.typed shipped, so downstream type
  checkers see the SDK's types.

🛠 Tooling & internals

• Toolchain standardized on uv + ruff + pyright (strict) + pytest-asyncio.
• Added AGENTS.md — the coding playbook for typing and versioning conventions.
• PyPI publishing via GitHub Releases using Trusted Publishing (OIDC) — no
  stored tokens — plus invoke release tasks.
• Added eval-type-backport (Python < 3.10) so Pydantic resolves X | Y field
  annotations on the new 3.9 floor.