Add GitHub Actions CI

[Smoss]

Summary

• Add GitHub Actions CI with separate lint and test jobs using uv and Python 3.12.
• Run ruff and mypy in CI, plus pytest for the test suite.
• Add a partial StateUpdate type for LangGraph node updates so mypy passes.

Test plan

• uv run ruff check .
• uv run mypy .
• uv run pytest tests/ -v

Made with Cursor

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 1b334450-1125-4e5e-b248-ec8e62fc127d

📥 Commits

Reviewing files that changed from the base of the PR and between 78c8f30 and e1e3d22.

📒 Files selected for processing (4)

• .github/workflows/ci.yml
• agent/character_agent.py
• agent/helldivers/nodes.py
• agent/state.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch cursor/add-github-actions-ci

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