ADK API reference doc auditor (api-ref-audit)

This skill audits the API reference documentation in the adk-docs repository across every language SDK and reports what is out of date. It is a reporting and guidance skill: it detects drift, recommends the correct per-surface release process, and emits an executable plan only when the user explicitly asks. It does not edit files, run generators, or open PRs by default.

The audit covers three kinds of drift:

1. Generated API reference docs under docs/api-reference/ that lag behind the latest SDK release.
2. Hardcoded version strings in prose and examples (dependency coordinates, pom.xml versions) that must be bumped with each Java/Kotlin release.
3. Code-sample drift (light flagging only): samples that reference pinned versions or obviously deprecated APIs. Deep sample verification is out of scope of this skill.