test: pin interpreter probe so py-template render test passes on Windows

[mnriem]

Summary

tests/test_command_template_py_scripts.py::test_template_renders_python_invocation fails on Windows runners (all 6 py:-scripted command templates) while passing on Linux/macOS — see run 29023156913.

Root cause

The _pin_interpreter fixture monkeypatches shutil.which to return /usr/bin/python3, intending to pin the rendered interpreter token to python3. But on Windows, resolve_python_interpreter() guards the which() result with a real _interpreter_runs() subprocess probe (added in #3304 to skip the Microsoft Store App Execution Alias stub):

if sys.platform == "win32" and not IntegrationBase._interpreter_runs(found):
    continue

The mocked /usr/bin/python3 path doesn't exist on a Windows runner, so the probe returns False, both python3 and python are skipped, and the resolver falls back to sys.executable (e.g. C:\hostedtoolcache\...\python.exe). The rendered invocation then starts with a Windows python.exe path instead of python3, failing the assertion:

assert re.search(r"python3 \.specify/scripts/python/\w+\.py(?: --[\w-]+)*", result)

Fix

Patch _interpreter_runs to return True in the _pin_interpreter fixture so the resolved interpreter token stays python3 across all platforms. This keeps the #3304 production guard fully intact — only the test's mock is made platform-independent.

Testing

• pytest tests/test_command_template_py_scripts.py → 20 passed locally (macOS). The fix targets the Windows-only fallback path.

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Opened by GitHub Copilot (model: Claude Opus 4.8) on behalf of @mnriem.

[Copilot]

Pull request overview

This PR fixes a Windows-only failure in tests/test_command_template_py_scripts.py::test_template_renders_python_invocation by making the interpreter pinning fixture compatible with the Windows runtime-probe behavior in IntegrationBase.resolve_python_interpreter().

Changes:

• Extend the _pin_interpreter autouse fixture to also monkeypatch IntegrationBase._interpreter_runs() to always return True.
• Ensure resolve_python_interpreter() consistently resolves to the python3 token under test across platforms (instead of falling back to sys.executable on Windows).

Show a summary per file

File	Description
tests/test_command_template_py_scripts.py	Pins the Windows-only _interpreter_runs probe during tests so rendered py: invocations stay anchored to python3.

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