macOS & Linux Validation

[Copilot]

LiveShell did not have explicit automated coverage proving the base package behaves consistently on macOS and Linux. This change adds platform CI for the supported Python versions and documents which checks define that compatibility surface, while keeping hosted PowerShell as an optional manual path.

• Platform CI

  • Adds a Platform Validation GitHub Actions workflow for ubuntu-latest and macos-latest
  • Runs the base-package validation path on Python 3.10–3.13:
    • unit tests
    • capability diagnostics
    • process smoke scripts
    • distribution build
  • Limits workflow token permissions to read-only repository contents

• Validation contract

  • Documents the macOS/Linux validation matrix in the README
  • Makes the automated coverage explicit for the non-optional runtime surface
  • Separates hosted PowerShell validation from the base matrix so optional dependencies do not gate core platform compatibility

• Diagnostics guidance

  • Updates scripts/diagnose.py to point users at the correct optional extra for hosted PowerShell:
    • python -m pip install ".[powershell]"

strategy:
  matrix:
    os: [ubuntu-latest, macos-latest]
    python-version: ["3.10", "3.11", "3.12", "3.13"]

[Copilot]

Pull request overview

Adds explicit macOS/Linux CI validation for LiveShell’s base package across supported Python versions, and documents the automated validation contract in the README while keeping hosted PowerShell as an optional/manual path.

Changes:

• Introduces a new GitHub Actions workflow that runs unit tests, diagnostics, smoke scripts, and python -m build on ubuntu-latest and macos-latest for Python 3.10–3.13.
• Documents the macOS/Linux platform validation matrix and separates optional hosted PowerShell validation steps in the README.
• Updates scripts/diagnose.py install guidance to reference the powershell extra.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
scripts/diagnose.py	Updates diagnostics output to point users at installing the powershell extra.
README.md	Documents the macOS/Linux validation matrix and clarifies optional hosted PowerShell checks.
.github/workflows/platform-validation.yml	Adds CI workflow for platform validation on Linux/macOS across Python 3.10–3.13 with read-only token permissions.

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