Add repo-audit profile for DungeonDex-style projects

[keepithandy]

Goal

Make dev-kit more useful as a reusable project-audit toolkit by adding a named audit profile for DungeonDex-style browser projects.

Current repo direction

dev-kit already presents itself as a Python command-line toolkit for read-only project audits and release hygiene. The README lists commands for audit, version, and report against a DungeonDex path.

Proposed work

• Add a named audit profile such as browser-game-static or dungeondex.
• Check for expected baseline files like VERSION.md, README.md, CHANGELOG.md, app entry files, and smoke scripts.
• Keep checks read-only.
• Make output friendly enough to paste into GitHub issues or release notes.

Acceptance checks

• Running the profile does not modify the target repo.
• Missing file checks report clear pass/fail messages.
• Version-label checks still work.
• Unit tests cover the profile selection path.
• README documents the new profile command.

Guardrails

This should stay generic enough to help more than one project, even if DungeonDex is the first target.