[codex] Release helloagentai 0.1.1 with handler tests

[hsyvy]

What changed

• Bumps helloagentai to 0.1.1 for the Python SDK release.
• Allows Agent message handlers to return None to acknowledge without emitting an empty final reply chunk.
• Adds focused SDK tests for handler behavior, websocket auth, reconnect/backoff, encrypted messages, user sends, token helpers, crypto, tools, keystore, channels, and discovery.
• Updates CI and release workflows to run ruff and pytest before building or publishing.
• Modernizes package license metadata to avoid setuptools deprecation warnings.

Why

The Hermes connector needs the Python SDK to support async handlers that perform work without sending an immediate reply. The previous behavior converted None into an empty final stream chunk, which looked like a reply on the wire.

Validation

• pytest --cov=helloagent --cov-report=term-missing --cov-fail-under=90: 38 passed, 95% coverage.
• ruff check helloagent tests: passed.
• python -m build: built helloagentai-0.1.1 sdist and wheel.
• Verified PyPI currently has helloagentai 0.1.0, so 0.1.1 is available.