Add .cursor AI autodevelopment harness (agents, skills, rules)

Made-with: Cursor

.cursor/rules/python.mdc

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+---
+description: "Python coding conventions: PEP 8, type hints, pydantic, pytest, async patterns, project structure"
+globs: ["**/*.py", "**/pyproject.toml", "**/requirements*.txt"]
+---
+# Python
+
+- Follow PEP 8: snake_case for functions/variables, PascalCase for classes, UPPER_CASE for constants
+- Use type hints on all function signatures; validate with `mypy` or `pyright`
+- Use `pydantic` for data validation and serialization
+- Import order: stdlib -> third-party -> local; use absolute imports
+- Use `src/` layout to separate app code from project files
+- Use context managers (`with`) for resource management
+- Catch specific exceptions, never bare `except:`; use custom exception classes
+- Use `async`/`await` with `asyncio` for I/O-bound concurrency
+- Use `pytest` for testing (not `unittest`); fixtures for setup/teardown
+- Use virtual environments (`venv` or `poetry`); pin dependencies
+- Format with `black`; lint with `ruff` or `flake8`