Answering whether the caption merge breaks the page-space key in
eval/chapter-truth.json. It does not. _merge_plan only groups adjacent
fragments and slice_webtoon cuts at gutter midpoints, so a vstacked panel's
[x, y0, w, sum(heights)] is the exact page region.
The defect is one line up. slice_webtoon skipped any segment shorter than
min_seg instead of absorbing it, so this chapter's 116 panels have a 62px hole
between panel_order 70 and 71 and lose 18px at the strip's end. A merge
spanning that hole reports a bbox 62px short of the page span it covers, and
every consumer mapping a detection back to the page is then wrong by that much,
silently. The 62px held the credits line, found at p_050.png row 338.
A short band is now held and absorbed by the next segment, or by the previous
one when it is last. min_seg still suppresses a tiny panel and no strip pixel
is discarded. The self-check asserts the bboxes tile the strip end to end.
Checks: worker_crop.py self-check passes and fails on the old code, where the
first band starts at 49 instead of 0. ruff check . exits 0.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
ARCHITECTURE.md step 0. eval/chapter-truth.json holds the 38 occurrences the
user walked crop by crop on the 19:44 run of 2026-08-12, and audit_registry.py
now prints purity per cluster and fragmentation per person against it. All six
baseline numbers reproduce.
Rows key on page-space geometry, purity is a share, and fragmentation is a
count of ids, so nothing in the file names a panel_id or a character_id. The
fifth cycle re-crops and calls /characters/reset, and the file survives both.
That was the ordering trap in the handoff.
NEXT.md said 2 of woman B's 9 crops were really woman A and never said which.
They are panel_order 31 and 33, identified from p030 and p032.
Four fixes to the audit itself, all pre-existing:
- 20 characters counted where 14 are live and 6 are merge losers kept on purpose
- the assignment spread keyed on name, so the two Seonhos summed into one line
- the default worked example was panel_index 7, a panel vision skips. NEXT.md's
"panel 7" is panel_order 7, one lower
- nothing about skipped panels. 41 of 116 are skip=True, four checked and all
four correct, and they hold 28 of the chapter's 122 dialogue lines
That last count is the measured case for an offscreen speaker_ref kind: 23% of
dialogue sits on panels with no character to attribute to.
Checks: audit_registry.py --selftest covers the IoU match, the greedy tie-break
and the purity maths with no database. ruff check . exits 0.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
kami