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9a678497ad
The #2101 guard that detects a body-specific 400 (context overflow / malformed / model-access-denied) logged "stopping combo" but executed a bare `break`, which only exits the inner retry loop. executeTarget then returns null, and the outer target loop treats null as "this target produced nothing" and advances to the next model — so the guard never actually stopped fallback, and a combo of N targets that all reject the same request body tried all N (the report shows a 143-model Codex combo marching through every target). Surface the 400 via the {ok,response} contract (mirrors the 499 client-disconnect path) so the outer loop resolves the combo and stops. Regression test: a 3-target priority combo whose targets all return a body-specific 400 must stop after target 1 (RED before, GREEN after). Closes #4279