Add Retry to Stream Errors

[sfreeman422]

No description provided.

[Copilot]

Pull request overview

Adds broader retry classification for transient transport-layer failures in ResilientOpenAIClient, aimed at improving resilience when OpenAI calls fail due to stream/connection issues (e.g., “Premature close”).

Changes:

• Refactors retry classification to detect network/transport failures via a new hasRetriableNetworkSignal() helper that inspects error message/name/code and follows cause chains.
• Keeps existing retry behavior for TIMEOUT (ResilientOpenAIError) and HTTP status-based retriable errors (429 / 5xx).
• Adds a regression test ensuring a FetchError with “Premature close” triggers a retry and succeeds.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
packages/backend/src/lib/resilientOpenAIClient.ts	Introduces hasRetriableNetworkSignal() and routes network/transport retry detection through it.
packages/backend/src/lib/resilientOpenAIClient.spec.ts	Adds test coverage for retrying transient “Premature close” fetch/stream failures.

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[Copilot]

Pull request overview

Copilot reviewed 3 out of 4 changed files in this pull request and generated no new comments.