`specify init --script py` generated skills that invoke
`python3 .specify/scripts/python/<name>.py`, but the wheel's
force-include list only carried `scripts/bash` and `scripts/powershell`.
Installs from PyPI/Homebrew therefore shipped commands pointing at files
that were never packaged, leaving `--script py` non-functional while
`sh`/`ps` kept working.
Force-include `scripts/python` alongside the other two variants, and add
a contract test that asserts every script variant present in the repo is
bundled, so a future variant cannot be dropped the same way.
Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
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