unseen-eval groups 4-6: generic AX batch dispatcher (engine_trace on it), replay task and image stage, scorer with adoption gate

Implemented with Codex.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

benchmarks/measurements/2026-10-04-unseen-06-scorer/record.json

@@ -0,0 +1,41 @@
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+    "5.4": "coordinator_pending"
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+  "scope": "offline synthetic scorer only",
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+}