Quarto warning on Linux/macOS from Windows-only QUARTO_PYTHON path in _environment

[gitlastoniagent]

Summary

Running report render commands on Linux/macOS shows a Quarto warning because _environment sets:

QUARTO_PYTHON=.venv/Scripts/python.exe

That path is Windows-specific.

Impact

This is currently a warning only (render still succeeds in local tests), but it creates noise and confusion in CI/local logs.

Reproduction

On Linux/macOS:

just render-html reports/analysis_report.qmd
# or
just render-docx reports/analysis_report.qmd

Observed warning (example):

• Specified QUARTO_PYTHON '.venv/Scripts/python.exe' does not exist
• No python binary found in specified QUARTO_PYTHON location

Expected behavior

No platform-mismatch warnings when rendering reports.

Suggested solution

1. Keep _environment platform-neutral (do not hard-code QUARTO_PYTHON there).
2. Set QUARTO_PYTHON per-OS in Justfile render/preview recipes.
   • Windows: .venv/Scripts/python.exe
   • Linux/macOS: .venv/bin/python3
3. Optionally document this behavior in README under report rendering.

Acceptance criteria

• just render-html reports/analysis_report.qmd runs without the Windows-path warning on Linux/macOS.
• just render-docx reports/analysis_report.qmd runs without the Windows-path warning on Linux/macOS.
• Windows render path still uses the venv interpreter.