Unity CLI Snippets Audit

Anti-rot maintenance for the snippet library. The library rots in four ways: API drift (Unity upgrade breaks bodies), integrity drift (files and audit entries diverge via merges / hand edits), staleness (cold, never reused), and zombie deprecations (retired but never removed). This skill detects all four and funnels cleanup through the CLI.

Running cs: below, cs is shorthand for python "$HOME/.unity-cli-plugin/current/cli/cs.py" — one stable path, run verbatim without changing directory. If it's not installed yet, run the unity-cli-setup skill once first.

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