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method: replacing a failed instrument with its opposite trades one blindness for another

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Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Wuu56cE8vJGTBtn1ppsk8v
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sylph-decoder
2026-08-30 22:25:25 +00:00
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@@ -2434,3 +2434,28 @@ that EXTRAS does **not** persist. Both moves treat a gap in the corpus as if it
carried information — they differ only in which direction they fill it. The
assertion happened to be right, which is exactly why it was worth measuring rather
than leaving to stand.
## Replacing a failed instrument with its opposite trades one blindness for another
A ring reader calibrated on the main menu's gutter column read a **static element**
on three other screens and reported "the cursor did not move" — it had moved, at
x 97..231, 338..1099 and 153..479. So I replaced it with a whole-frame comparison,
which needs no per-screen geometry at all, and controlled the new rule against a
screen whose answer was already known. It passed.
Then Xenia's crash dialog appeared over the screen centre, and a whole-frame
identity test **can never match again** once anything overlays the frame. The
narrow column the dialog did not cover had been reading correctly the whole time.
⚠️ **I chose the global rule precisely because the narrow one had just failed**,
and that is the trap: after a specific instrument fails, the general one *feels*
safer, and its failure mode is simply one you have not met yet. A reader that looks
everywhere is fragile to anything that changes anywhere; a reader that looks in one
place is fragile to that place being wrong. Neither dominates — and the honest move
is to say which failure each is exposed to rather than to believe the newer one is
"more robust".
📌 The corollary that saved the iteration: a run written off as failed can still
carry a measurement. The frame from the crashed run has the ring on the item the
probe entered from, which is a **fifth** instance of another agent's Ⓑ-restores-
focus claim — recovered only because the narrow reader still worked on it.