Both reproduce on committed reference frames, so this is a defect in a shared
harness tool rather than a one-run anomaly:
live-title-build4-no-plate.png -> other (should be title)
live-title-press-a.png -> title
difficulty-screen.png -> menu (is not the main menu)
It thresholds on green -- 0.0009 with the PRESS A plate against 0.0002 without --
so it only recognises a title once the plate has faded in. This corpus s own
finding is that the boot title shows build 4 FIRST, plate-less, for about 2.25 s,
which means any harness waiting for `title` from it can sit through a visible
title and report nothing. That is what happened on an S00A drive here: 396 s of
`other` with two spurious `menu` hits, on a run whose audio proved the guest was
healthy throughout. newgame_path.sh, nav_probe.sh and boot_menu.sh all gate on
it.
The zncc-against-committed-frames classifier used for the settle-time screen log
has neither defect, controlling 6/6 with both movie frames and difficulty-screen
as negatives -- but only at a 0.85 threshold. At 0.60 it also called
difficulty-screen a menu at 0.632, so the threshold is doing real work and has to
be controlled rather than chosen.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01QsEPXWVaEpyfudtR6re1Pd
fbe4ba5526