(#755)

* Align the 2.17 Audiences and Dynamic Content reference with what the API does

Corrects the role predicate examples and the predicate value type, documents the error responses as the API sends them, notes the PATCH route and HTML-escaped names, and adds the accepted OAuth scopes to each operation.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

* Apply the Audiences and Dynamic Content corrections to Preview

Ports the 2.17 changes to the same operations and schemas in the Preview spec, so Preview matches what the API does too. In the Preview SDK, `Predicate.value` becomes `unknown` because the API accepts and returns strings, numbers, booleans, arrays and null.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

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Co-authored-by: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

Author: markdennis22