login: drop persistLogin's unused errW parameter

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toothbrush3mo ago

With the legacy dual-write's warn-and-continue gone, persistLogin never writes to stderr.

Co-Authored-By: Claude Fable 5 noreply@anthropic.com Entire-Checkpoint: b7c0ca0b79e1

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Auth Refactor: Eliminate Static Fallbacks

Claude CodeFable 5.[1m]
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