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* fix(combo): surface context-overflow before compression so oversized requests fail fast with a clear error (#10225) * fix(combo): make context-overflow deferral target-aware for native Codex passthrough (#10225) The deferral added by the prior commit checked only operator-named compression exclusions when deciding whether at least one target "can compress" — it never accounted for native Codex Responses passthrough targets, which chatCore.ts unconditionally excludes from compression (compressionExcluded = nativeCodexPassthrough || ...). Deferring on such a target's account let an oversized request skip both the combo preflight AND compression, reaching fetch() uncompressed. Thread the same request-shape facts chatCore.ts uses (shouldUseNativeCodexPassthrough: provider/sourceFormat/endpointPath/body/ headers) down into getKnownContextOverflow so the deferral decision can never drift from chatCore's own — a native-codex-passthrough target now never counts as "compressible", so a pool made only of such targets keeps the fast local 400 instead of a wasted round trip. Adds regression coverage: the pure getKnownContextOverflow target-aware check, an end-to-end handleComboChat proof that a native-codex-only pool fails fast with zero dispatches, and two real handleChatCore-path tests proving compression actually reduces the dispatched body when eligible, and that a still-too-large-after-compression request is rejected locally without an upstream call. --------- Co-authored-by: adevwithpurpose <adevwithpurpose@users.noreply.github.com>