Move CLI docs release automation into docs

[llewellyn-sl]

What changed

• replace the failed tower-cli source/Gradle extraction path with a docs-owned extractor compiled against the published tw-jar.jar
• verify the release checksum and stable-release status before generation
• compare current and previous resolved picocli command models
• recursively regenerate reference pages, preserve exact-path overlays, and reject orphaned overlays
• keep raw metadata as a short-lived Actions artifact instead of committing it
• add stable-only draft PR creation, manual dry runs, and a scheduled recovery check
• add the CLI release review skill and the platform-cli-docs ownership/runbook README
• include Platform CLI pages in Netlify deploy previews

Why

The previous workflow called a Gradle metadata task that does not exist on tower-cli master, so every scheduled update failed. Keeping extraction and generated metadata in tower-cli was also rejected as repository bloat. This makes the released CLI JAR the contract and leaves tower-cli responsible only for sending a small release notification.

Impact

After this merges, stable tower-cli releases can produce deterministic draft documentation PRs without checking out tower-cli source or using GitHub Packages. Conceptual inference and examples remain an explicit review step guided by the new skill.

This PR intentionally excludes the generated current-release parity snapshot. That output is in the stacked docs #1745, produced by running this implementation locally against v0.38.0.

Validation

• live checksum verification and extraction from tower-cli v0.38.0
• like-for-like comparison with v0.37.0
• six Python tests
• actionlint on both workflows
• skill validator
• Platform CLI + Platform Cloud + changelog Docusaurus production build
• repository pre-commit hooks

[netlify]

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