Bring Platform CLI docs to v0.38.0 parity

[llewellyn-sl]

What changed

• regenerate the Platform CLI reference from the verified tower-cli v0.38.0 release JAR
• capture 181 visible commands across 20 top-level commands, including resolved nested commands and provider/mixin options
• add the missing generate-completion reference page, sidebar entry, command index entry, and usage overlay
• add idempotent v0.38.0 notices and the small processed-release marker
• document the v0.38.0 private Studio allow-list behavior for studios add, add-as-new, and start

Source and verification

• Release: https://github.com/seqeralabs/tower-cli/releases/tag/v0.38.0
• Release type: published stable release
• tw-jar.jar SHA-256: 68309ff47dc7be69323765db1805099a235ad9448a58eac15dae28f486218e56
• Metadata source: resolved picocli runtime command model from the released fat JAR
• Raw metadata: not committed; workflow runs retain it as a short-lived artifact

The release-to-release comparison with v0.37.0 found three option additions:

• tw studios add --allow-user
• tw studios add-as-new --allow-user
• tw studios start --allow-user

Why

The existing CLI reference was generated from an older shallow metadata model. It omitted deep compute-provider and workspace settings options and did not include every top-level command. This establishes the first docs-owned stable-release baseline.

Stack and merge order

This PR is stacked on #1744, which adds the extractor, generator, workflows, tests, review skill, and preview support used to produce these changes. Review and merge #1744 first; this PR should then contain only the generated/editorial parity delta against master.

Validation

• live release download and checksum verification
• Java 21 extractor compilation against the released JAR
• comparison with v0.37.0
• six Python tests
• no orphaned overlays
• Platform CLI + Platform Cloud + changelog Docusaurus production build
• repository pre-commit hooks