docs: upstream host & auth-context resolution model
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Document the "one core + resource servers" model, what control-plane context resolution now does, and the deferred entire.io well-known (entire-api.json) + audience token-exchange work for the data API family.
Co-Authored-By: Claude Opus 4.8 (1M context) noreply@anthropic.com Entire-Checkpoint: bcf3c60f07df
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