[junhsss]

computer, checkpoint, secret and environment only shipped in the 0.5.0 previews. The stable 0.4.4 never had them. This removes them.

• Remove the four command groups, their API modules, util/pairs.rs, and their tests.
• Drop the computer.defaultId config field. An existing value is dropped the next time the config is written.
• Skip these groups in scripts/generate-api.mjs, so regenerating from the OpenAPI spec does not bring them back.
• Drop russh and rustix. rsa is no longer in the tree, so its advisory ignore in deny.toml goes too.
• Point the describe API-operation tests at sessions get and sessions logs. They used to cover computer exec and computer ssh.
• Make the retry-later hint generic. It said "The computer is not ready".
• Regenerate docs/cli-reference.md.

cargo deny check fails on main too. #117 fixes rustls. zip and unsafe-libyaml still need their own changes.

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