chore: add py.typed, tools.py, and uv.lock

[DaKev]

What

Add previously untracked package files: cutagent/py.typed (PEP 561 marker), cutagent/tools.py (AI tool schemas for agent integration), and uv.lock (lock file for reproducible installs).

Why

• py.typed is required by pyproject.toml package-data for type-checked distributions
• tools.py provides dump_all_schemas() and get_tool_schema() referenced in the README agent section
• uv.lock ensures reproducible dependency resolution

How

Staged and committed the files. Removed one-off fix_tests.py script (no longer needed).

Checklist

• Tests added/updated — N/A
• All tests pass — N/A
• JSON output contract maintained — N/A
• Docstrings added — N/A
• Type hints — N/A
• CHANGELOG.md updated — N/A (chore)
• No new runtime dependencies — Yes

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