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Four zones had NO POSTER AT ALL. measureHeader() opened with
`if (!SPARSE) return HEADER_BASE` — a flat 460 — so the per-zone measurement its
own comments describe ("HEADER IS PER-ZONE, NOT A SHARED CONSTANT...
measureHeader() predicts the height from the zone's OWN content") only ever ran
in SPARSE mode. Outside it, any zone whose header was taller than 460 tripped
the fail-loud guard and rendered nothing:
oceania-indonesia 504 andean-caribbean 504
asia-china-tibet-autonomous-region 481 deaf 619
Raising the constant was not the fix. HEADER is subtracted from the map height,
so 460 -> 620 would have stolen 160px of map from the 25 healthy sheets to
rescue 4 — the exact tradeoff the per-zone measurement exists to avoid, and the
one its own comment records (tuned to North India, it overflowed west-africa;
tuned to west-africa, it stole from everything else).
MEASURED the real header on six zones instead:
HEAD_BOTTOM = (headY + 34) + 118 exact on all six
headY = 191 + 23 * tableLines exact on all four probed
The 118 is the two vision columns — a constant 104, because that copy is fixed
and wraps identically on every sheet — plus the 14px trailing gap. ALL per-zone
variation is the facts table, which advances 23px per wrapped line. So this is
arithmetic on the same inputs the renderer wraps, not an estimate, and it needs
no calibration history like the SPARSE model's +24/+52/+66/-8/+6 above it.
★ THE ERROR WORTH RECORDING: my first attempt derived the constant by READING
the code — tracing headY's assignments to 150 + 23n - 12 — and was 53px short on
every zone, because the scripture block between the table and the vision columns
also advances the cursor and I had not traced it. Every zone then failed,
including ones that worked before. Deriving it from four measured renders got it
exact. Reading selectively is not measuring.
Result: 28 posters render, zero failures. And the map GREW on the healthy
sheets, because they no longer pay for the worst case — laos' map frame starts
at y=443 against the old flat 460, while deaf takes the 627 it genuinely needs.
Still missing after this: deaf-old-world and deaf-new-world-asia-pacific, which
never reach the render at all (silent skip, exit 0 — they are `deaf_predicate`
selectors that leafZones() does not return). Different cause, carded separately.
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