Generate Markdown audit reports

[keepithandy]

Goal

Make python -m dev_kit report --path <repo> --output devkit-report.md write a clean Markdown report that can be pasted into GitHub issues, release notes, or project notes.

Proposed report sections

• Project path and timestamp.
• Overall status summary.
• Version-label check results.
• Baseline file check results.
• Warnings and recommended next actions.

Guardrails

• Report generation must not mutate the audited project.
• Output path should be explicit and predictable.
• The report should be readable on mobile, not just in a terminal.

Acceptance checks

• --output creates or overwrites only the requested report file.
• Report includes pass/fail summaries for each audit group.
• Missing output directory gives a friendly error.
• Unit tests cover report formatting and output behavior.