Migrate workflow to GitHub Actions, modernize TOC script, document PR #18 templates

[Copilot]

Workflow was running on self-hosted runner; script lacked proper error handling and structure; wiki didn't reflect the issue/PR templates added in PR #18.

Workflow (update-readme.yml)

• runs-on: self-hosted → runs-on: ubuntu-latest
• Added actions/setup-python@v5 step

Script (scripts/order.py)

• Refactored to use pathlib instead of raw os calls
• Added proper if __name__ == "__main__": entry point
• Added error handling with try-except for file operations
• Modularized into documented functions
• Added wiki to EXCLUDE set
• User feedback on stdout (success/no-op)

def main():
    readme_path = Path(README)
    if not readme_path.is_file():
        print(f"Error: {README} not found", file=sys.stderr)
        sys.exit(1)
    try:
        projects = collect_projects('.')
        # ...
    except (OSError, ValueError) as e:
        print(f"Error: {e}", file=sys.stderr)
        sys.exit(1)

Wiki updates

• Home.md: Added "Issue & PR Templates" section with links
• Contributing.md: Documented all four issue templates; referenced PR template
• _Sidebar.md: Added Templates section with direct create-issue links

Housekeeping

• Added .gitignore for __pycache__/, build dirs, IDE files

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