fix(triage): make main's CI green again after the triage gate

[Makisuo]

Why

#960 merged with CI red, so the deployment gate has refused every deploy since (Nothing was deployed: CI did not pass). Prod is still on the commit before it: the Jev triage gate, #959 and #962 are all undeployed.

What

• Stale generated list. IncidentTriageUnauthorizedError is 4xx-annotated, so anticipated-errors.test.ts expected it in generated/anticipated-error-identifiers.ts. Regenerated with gen:anticipated-errors.
• Binding fetch type. typecheck-api resolves typeof globalThis.fetch to a type that carries preconnect, so the classifier's fetchOverBinding failed TS2741 there. IncidentClassifier now builds its HttpClient directly over the AI_WORKER binding with fromCloudflareFetcher + toHttpClient, the adapter apps/api already uses to forward to maple-ai. The FetchHttpClient.Fetch detour and the layer's FetchHttpClient.layer dependency go away.

Verified

• IncidentClassifier.test.ts and anticipated-errors.test.ts pass.
• typecheck green for packages/backend, apps/api (the failing job) and apps/alerting.
• oxlint / oxfmt clean on the changed files.

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Reviewing files that changed from the base of the PR and between 987237c and ca9a76c.

⛔ Files ignored due to path filters (1)

• packages/domain/src/generated/anticipated-error-identifiers.ts is excluded by !**/generated/**

📒 Files selected for processing (1)

• packages/backend/src/services/errors/IncidentClassifier.ts

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✅ Devin Review: No Issues Found

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