docs: align README, comments, and host-resolution doc with no-fallback auth

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toothbrush3mo ago

Local-dev instructions switch from exporting ENTIRE_AUTH_BASE_URL to entire login --server; upstream-host-resolution.md drops the fallback steps that no longer exist; stray comment references to the deleted TokenForResource path and env var are reworded.

Co-Authored-By: Claude Fable 5 noreply@anthropic.com Entire-Checkpoint: 829766ddb442

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Auth Refactor: Eliminate Static Fallbacks

Claude CodeFable 5.[1m]
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