docs(skill): add audit-clerk-skill for drift detection

[wyattjoh]

Summary

New user-invocable skill that cross-checks skills/clerk/ against packages/cli-core/src/commands/** and proposes targeted edits when the two drift.

Reads per-command README.md files as a secondary source (to flag mocked or hidden surfaces), prefers --help over enumerating flags, and routes proposals between SKILL.md, references/agent-mode.md, references/auth.md, and references/recipes.md based on content type.

Configured with effort: high, disable-model-invocation: true (manual maintenance task), and an optional --apply argument to write changes rather than just proposing them.

Stacked on #126.

Test plan

• Manual: invoke /audit-clerk-skill and confirm it produces the documented output shape (bucketed proposals, source citations, severity tags)
• Manual: run with --apply on a synthetic drift case and confirm it writes only drift and gap edits, leaving polish suggestions for review

[wyattjoh]

Stack: init-skills

• feat(lib): add NonEmptyArray helper, tighten preferredRunner #125
• feat: Clerk CLI Skill #126
  • feat(init): support CLERK_SKILL_SOURCE env override #127
  • docs(skill): add audit-clerk-skill for drift detection #156 👈 this PR

Part of a stacked PR chain. Do not merge manually.

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