fix: preserve video models from v3 custom-provider fallbacks - #21119
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Co-authored-by: brennanbutler01 <64561607+brennanbutler01@users.noreply.github.com>
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Background
customProvider fallback video lookup threw AI_NoSuchModelError for supported v3 providers even though direct, alias, and registry lookups succeeded.
Root Cause
asProviderV4 omitted the experimental videoModel method while customProvider queried the adapted fallback; the reproduction confirmed the resulting loss of the v3 model.
Summary
Video fallback lookup now uses the original provider with its receiver preserved and adapts returned v3 models to v4. Added an ai patch changeset.
Testing
Added regression coverage verifying v3 fallback video models are adapted to v4 and invoked with the original provider receiver.
End-to-end Validation
replay_original_reproduction: completed successfully with no AI_NoSuchModelError bug signal (no-longer-reproduces).Related Issues
Fixes #21110
Closes #21113