test(ai-gateway-provider): cover unified dynamic routes

[dhruvil-codes]

Summary

Adds live E2E coverage for AI Gateway unified dynamic routes.

The existing ai-gateway-provider E2E suite covers provider/BYOK routing through the universal endpoint, but does not exercise a dynamic route resolving to a Workers AI model.

This adds a gated E2E case using:

aigateway(unified(DYNAMIC_ROUTE))

and verifies that generateText successfully returns the expected response through the universal-endpoint REST path.

Motivation

Issue #617 reports that a dynamic route targeting Workers AI fails through the AI Gateway universal endpoint while the same request succeeds through /compat/chat/completions.

This test exercises the affected ai-gateway-provider path and provides regression coverage for the universal-endpoint dynamic-route flow.

Testing

• pnpm --filter ai-gateway-provider type-check
• vitest --config vitest.e2e.config.ts --watch=false test/e2e/gateway.e2e.test.ts
• oxfmt --check test/e2e/gateway.e2e.test.ts

All checks pass locally. The live dynamic-route case is gated by CLOUDFLARE_AI_GATEWAY_DYNAMIC_ROUTE.

Refs #617

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[ArshVermaGit]

Nice test addition. Covering the unified dynamic route improves confidence in the AI Gateway routing flow and helps catch regressions in the affected path. The changes are focused and fit well with the existing test suite. LGTM.