fix(ci): pin Python discovery to the intended interpreter#6105
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The manylinux/musllinux images added Python 3.15 and dropped 3.13t; FindPython's version scan then picked /usr/local/bin/python3.15 over the uv-created venv (Python_ROOT_DIR is only a hint). Similarly, the macOS and Windows 3.14t jobs picked a system 3.14 over setup-python's free-threaded interpreter. Pin the interpreter explicitly in both places, and drop the 3.13t manylinux jobs. Assisted-by: ClaudeCode:claude-fable-5
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CI has been red since the manylinux/musllinux images added Python 3.15 and dropped 3.13t, and the same runner refresh broke the free-threaded jobs on macOS and Windows:
uvcreates the requested venv, butPython_ROOT_DIRis only a hint: FindPython's version scan tries 3.15 first and finds/usr/local/bin/python3.15on PATH before considering the venv's older interpreter. All four jobs then built against 3.15 and failed at the pytest step (No module named pytest).Fixes:
CMakeLists.txt: when the venv machinery setsPython_ROOT_DIR, also pinPython_EXECUTABLEto the venv's interpreter, making discovery exact instead of heuristic.reusable-standard.yml: pass setup-python's interpreter to CMake as-DPYTHON_EXECUTABLE(works in both old and new FindPython modes).ci.yml: drop the 3.13t manylinux rows; the images no longer ship 3.13t, and 3.14t rows already exist.Suggested changelog entry: