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90458a613c
The `instanceof Response` guard from #10256 broke two ways: 1. `instanceof` is nominal against `globalThis.Response`, but proxyFetch dispatches through the npm undici package's fetch, whose Response is a different class — so valid upstream responses were rejected as contract violations. Replaced with `isResponseLike()` (instanceof fast path + structural brand/member probe); genuinely malformed shapes still throw. 2. The thrown error had no `.status`, so it fell through to chatCore's BAD_GATEWAY default — an internal defect was treated as a flaky provider, cooling the connection down and retrying forever. It now carries status 500 + `executor_contract_violation`, registered as request-scoped and terminal (no cooldown, no breaker, no retry). batch_api.test.ts went from exit 124 (infinite hang, pinning Unit shard 4/4 in every open PR) to exit 0, 22/22 passing. Closes #10360