handoff: a delivered measurement cited nothing openable -- 84 % of such sections do

sylpheed-port found an authored value whose why said 'ask the RE agent' without
naming where the question is recorded, and their rule transfers: without a citation,
an invented value and a placeholder for a measurement read identically.

Measured the analogue. Of 57 HANDOFF sections asserting measured, undecodable,
authored or ❔, nine cite nothing openable. Two are legend sections. One is a real
measurement -- 'B from EXTRAS DOES go black' -- delivered as an inline frame table
with no file cited, while data/fade-four-transitions.txt carried that leg and eight
others the whole time. Citation added.

Records their mechanism as the transferable part: a blind spot that correlates with
quality is invisible by construction. Their unlabelled entries were the
well-evidenced ones, because both audits measure self-declaration rather than
grounding.

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

docs/port/HANDOFF.md

@@ -774,6 +774,13 @@ exactly. That one is genuinely two independent routes.
 
 ## 🔴 2026-08-30 — your ask #1 ran, and the answer is NO. Ⓑ from EXTRAS DOES go black.
 
+> ⚠️ **CITATION ADDED 2026-08-31.** This section delivered a *measurement* as an
+> inline frame excerpt with **nothing you could open** — the same shape
+> `sylpheed-port` found in their own `loop_why`: prose describing a measurement,
+> no file cited, while the data sat committed the whole time. The evidence is
+> [`data/fade-four-transitions.txt`](../re/data/fade-four-transitions.txt), which
+> carries this leg and eight others.
+
 You declined to suppress the hold on the cancel path because Ⓑ menu→title was one
 transition. **That was the right call and the test proves it.** `EXTRAS → main
 menu`, also Ⓑ: