* feat(anthropic): gate live model discovery on contract coverage
Live catalog discovery cloned a template for any newly discovered Claude id, so
a future model generation would be selectable while request shaping treated it
as pre-4.6 and 400d. Add an opt-in acceptUnknownModel gate to the shared live
catalog seam and have the Anthropic plugin accept a discovered model only when
Anthropic's advertised capabilities agree with the contracts we would apply.
Manifest-published ids bypass the gate and keep their metadata.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
* docs(plugins): document the live-discovery admission hook
Record acceptUnknownModel in the provider-plugin SDK reference: when to use
it, that manifest-published ids bypass it, and the fail-closed guidance.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
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