re: the refuted register ignored the deaths I just wrote, and two false positives shared a cause

Three refutations written as prose under ### headings never entered the register:
check_refuted.py parses * "claim" lines, so the count stayed at 188. Registered
them properly (188 -> 192). A register that parses one syntax silently ignores
every other, and it is invisible from the author's side -- ask the register what it
holds, do not re-read what you wrote.

Both standing false positives were bullets under a header that retracts the whole
list, with no marker in the +-4-line window: scope marks them, not proximity. The
scan now includes the nearest preceding header and matches markers
case-insensitively ('An earlier version' was missed by the marker 'an earlier
version'). Controlled by planting a real revival and confirming it is still caught;
register now runs clean at 0.

Also records sylpheed-port's diagnosis of the phase-lock fallout: a number can be
inapplicable rather than wrong, and a tension built on one is manufactured. Plus
their point that some claims are not registrable in a substring register at all.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Wuu56cE8vJGTBtn1ppsk8v

tools/re-capture/check_refuted.py

@@ -25,7 +25,7 @@ from pathlib import Path
 
 MARKERS = ("refuted", "REFUTED", "withdrawn", "WITHDRAWN", "retracted", "RETRACTED",
            "🔴", "~~", "used to say", "used to read", "was wrong", "is wrong",
-           "no longer", "superseded", "corrected",
+           "no longer", "superseded", "corrected", "retracts", "an earlier version",
            # text explicitly DECLINING to revive a claim reads as an assertion to
            # a neighbourhood scan; two real hits were exactly this.
            "does **not** revive", "does not revive")
@@ -61,8 +61,19 @@ for c in claims:
         for i, l in enumerate(lines):
             if needle in l:
                 lo, hi = max(0, i - CTX), min(len(lines), i + CTX + 1)
-                near = "\n".join(lines[lo:hi])
-                if not any(m in near for m in MARKERS) and (f, i) not in seen_report:
+                # ⚠️ A +-CTX neighbourhood misses the commonest real marker: a
+                # SECTION HEADER that retracts a whole list. Two false positives
+                # were exactly this -- bullets under "## 🔴 What this retracts",
+                # each bullet a claim being killed, no marker within 4 lines.
+                # Scope, not proximity, is what marks them, so include the
+                # nearest preceding header in the scan.
+                hdr = ""
+                for j in range(i, -1, -1):
+                    if re.match(r"#{1,4} ", lines[j]):
+                        hdr = lines[j]
+                        break
+                near = "\n".join(lines[lo:hi]) + "\n" + hdr
+                if not any(m.lower() in near.lower() for m in MARKERS) and (f, i) not in seen_report:
                     seen_report.add((f, i))
                     hits += 1
                     print(f"🔴 {f}:{i+1}")