[purpshell]

Prepares opaque machine-credential acceptance and growth-safe CLI authentication guidance. The canonical API credential fixture remains byte-identical to the accepted producer.

Rebased with merge topology preserved onto main 044f8b7. The resulting tree matches the preserved integration candidate; authorship and range evidence are retained.

Remains draft: the declared published SDK dependency lacks the required opaque-credential validators, and fresh full CLI qualification needs a matching installed dependency graph. No fallback parser or guessed package version was introduced. New-head CI, independent approval, package publication and deployed availability remain separate.

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