Closes#3937.
Adds three small classification gaps to `classifyErrorType` so that
quota-exhaustion errors from a wider range of providers trigger
configured fallback chains instead of looping retry attempts:
- Normalize error names by stripping `_` and `-` so snake_case /
SCREAMING_SNAKE_CASE provider names (`insufficient_quota`,
`RESOURCE_EXHAUSTED`, `rate_limit_exceeded`) match the existing
alphanumeric `.includes()` checks.
- Add `resourceexhausted` to the quota error-name allow-list to cover
Google Generative AI's gRPC code 8 / `ResourceExhausted` surface.
- Add `/resource.?exhausted/i` to the quota message-pattern list so the
same error surface is caught when the provider only sets a generic
error name but puts the signal in the message.
Three new regression tests in
`quota-error-classifier.regression.test.ts` cover:
- Google `RESOURCE_EXHAUSTED` (gRPC error name + quota-shaped message)
- Google `ResourceExhausted` message form without HTTP status
- OpenAI snake_case `insufficient_quota` error name
No existing tests were touched; the underscore normalization preserves
all existing `.includes()` matches by rewriting the one underscore-bearing
literal (`ai_loadapikeyerror` → `ailoadapikeyerror`) so previously
matched names still resolve.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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