Add cli.py entry point for documented CLI usage

[Copilot]

README documents python cli.py --help but the file doesn't exist. CLI is implemented in src/main.py which uses relative imports incompatible with direct execution.

Changes

• cli.py: 11-line entry point that imports and delegates to src.main.cli()
• tests/test_cli.py: Subprocess-based tests for CLI entry point and all subcommands
• .gitignore: Add Python patterns (__pycache__/, .coverage, etc.) and remove tracked cache files

# cli.py
from src.main import cli

if __name__ == "__main__":
    cli(obj={})

All existing tests pass. No changes to core CLI implementation.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• api.example.com
  • Triggering command: /usr/bin/python python -m pytest tests/ -v --tb=short (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

task python cli.py --help

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