The decoy suite is a gate of the full run (R-1116); scripts only, no release

scripts/test_gate_decoys.py is now agent_gates.py's `gate-decoys` row: the full run (which CI runs on every
push), not --fast (~20 s in the workspace, 30 cases). Declared in its own COVERS; test_agent_gates.py pins it.
Red-proved: a reuse-refs FACT case flipped to expect rc 0 -> CONVICTED: gate-decoys; restored, green.

Claude-Session: https://claude.ai/code/session_0159rPz1ZhFKsS53msqPYxtS

scripts/test_gate_decoys.py

@@ -66,6 +66,9 @@ COVERS = {
                     "inside an HTML comment (R-426)",
     "observations": "R-419 in THIS repo's REPORT.md: an Observations note SAYING it carries no marker - vs the "
                     "two genuine markers (R-426)",
+    "gate-decoys": "this suite, run as a gate of agent_gates.py's full run, which CI runs on every push (R-1116): "
+                   "every case above is a decoy of its own gate, and ONE case that stops convicting turns the run "
+                   "red - red-proved 2026-10-17 by flipping a reuse-refs FACT case to expect rc 0",
 }
 
 fails = []