v4.5.0: lazy in Copilot

This release is mostly other people, and that's the point. GitHub Copilot CLI is now a full plugin host, contributed by @maxfelker (a Microsoft engineer) who built it with Copilot, tested it live, then reviewed his own PR in ponytail ultra (the headline finding was "delete a test"). CI, an npm test script, and a python3 fix came from @christophermayfield. Plus a fix for the hooks erroring when node isn't on PATH (Nix/nvm setups). The tool that does less got more thorough by getting more hands.

• GitHub Copilot CLI plugin: copilot plugin marketplace add DietrichGebert/ponytail then copilot plugin install ponytail@ponytail.
• CI on every push and PR, plus npm test.
• Correctness checks work on macOS/CI now (python3 probe).
• Hooks degrade gracefully when node isn't on PATH.

What's Changed

• Adding support for Copilot Marketplace plugin by @maxfelker in #47
• docs: bump the agents badge to 13 by @DietrichGebert in #56
• fix: use python3 for correctness checks and add CI by @christophermayfield in #50
• fix: hooks degrade gracefully when node is not on PATH by @DietrichGebert in #57
• docs: note the Codex install also covers the desktop app by @DietrichGebert in #59
• chore: bump version to 4.5.0 by @DietrichGebert in #60

New Contributors

• @maxfelker made their first contribution in #47
• @christophermayfield made their first contribution in #50

Full Changelog: v4.4.0...v4.5.0