Backlog triage Part B: 125 finished rows + 20 id-less rows moved to CLOSED-ITEMS (full text at 9e2786c); open rows normalised to one 6-column shape; narratives archived verbatim; closed_register_gate RULE 3 refuses a finished row in OPEN-ITEMS (decoys, seen red); rules rehomed to CONTEXT + 07 §11; loose notes triaged; R-814..R-819 filed; register 444 -> 325

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0159rPz1ZhFKsS53msqPYxtS

scripts/test_gate_decoys.py

@@ -43,7 +43,9 @@ COVERS = {
     "observations":    "R-419: prose SAYING it carries no marker, plus both genuine markers",
     "reuse-refs":      "a cited .go path that does not exist; the .md hole is asserted as R-422",
     "golden-currency": "R-410: an empty directory with a perfect name, checked by what it COUNTED",
-    "closed-register": "a verdict cell reading open, and a row with no state cell at all",
+    "closed-register": ("a verdict cell reading open, a row with no state cell at all, and (RULE 3, "
+                        "2026-10-03) a FINISHED row left in OPEN-ITEMS.md — with R-87's shape, a READY "
+                        "row whose prose says 'closed' about another row, asserted to PASS"),
     "register-shape":  ("R-627: a row whose state cell was EATEN (no trailing pipe), a DUPLICATED "
                         "id, and a blank line splitting the table — each the exact shape the "
                         "2026-09-21 append produced; plus the genuine article, which must pass"),
@@ -210,6 +212,32 @@ decoy("closed-register/unreadable-row", "closed_register_gate.py",
       append_to(os.path.join(ROOT, "documentation", "backlog", "CLOSED-ITEMS.md"),
                 u"\n| **R-905** | A row with no state cell at all. |\n"))
 
+# --- closed-register RULE 3 (2026-10-03): a FINISHED row left in the OPEN register ---------------
+# On 2026-10-03 the open register held 113 rows whose leading verdict was finished — a quarter of the
+# file. The decoy is that exact shape: a row a session closed in place and never moved. The genuine
+# article beside it is R-87's shape from R-378: a READY row whose prose says "closed" about ANOTHER
+# row — it must pass, or the gate repeats the 2026-08-22 sweep's mistake one file over.
+# The row is built from the register's CURRENT header, so the decoy follows a column change rather
+# than silently testing a shape the file no longer has.
+_OPEN_REG = os.path.join(ROOT, "documentation", "backlog", "OPEN-ITEMS.md")
+
+
+def _open_row(rid, state):
+    cols = None
+    for line in io.open(_OPEN_REG, encoding="utf-8"):
+        if line.startswith("| ID |"):
+            cols = [c.strip() for c in line.strip().strip("|").split("|")]
+    fill = {"ID": "**%s**" % rid, "Category": "Process & tooling", "Sev": "P4",
+            "What": "**A decoy finding.**", "State": state, "Owner": "CC"}
+    return u"\n" + u"| " + u" | ".join(fill.get(c, u"—") for c in cols) + u" |\n"
+
+
+decoy("closed-register/finished-row-in-open", "closed_register_gate.py",
+      append_to(_OPEN_REG, _open_row("R-906", "**CLOSED 2026-10-03 — shipped in v9.9.9**")))
+decoy("closed-register/open-row-closed-word (BY DESIGN)", "closed_register_gate.py",
+      append_to(_OPEN_REG, _open_row("R-907", "**READY — RE-RANKED UP 2026-08-03 (R-86 closed)**")),
+      expect="accept")
+
 # --- hub-copy: an ENGLISH retrieval promise, planted in the bundle (R-558) -----------------------
 #
 # TWO SHAPES AT ONCE, and the second is why this decoy exists at all.