Visual verification surfaced two render bugs (controller LOGIC was already correct):
1. BACKDROP WASH-OUT (the big one — #145 continuation). The mounted backpack/
3D-items panels inherited their sub-window root's ZLevel 1000 via the merge's
zero-wins-base rule. The #145 ZOrder fold (ReadOrder − ZLevel·10000) turned 1000
into ZOrder ≈ −10,000,000 — sinking the panels BEHIND the frame's Alphablend
backdrop (ZLevel 100 → ≈ −1,000,000). The backdrop then overpainted the panels'
captions/burden-meter/cells (the paperdoll root is ZLevel 0 so it escaped, which
is why the previous session thought #145 was done). Fix: the sub-window mount now
keeps each slot's OWN frame ZLevel, so panels sit in front of the backdrop.
Root-caused via a one-shot sprite-segment-order dump (backdrop was painting after
the panel content) + a live ZLevel probe.
2. CAPTIONS. The caption elements resolve to UiText; driving a nested child UiText
didn't paint. AttachCaption now drives the host UiText directly.
Locked by InventoryFrameImportProbe (real-dat smoke: asserts each mounted panel's
ZOrder > the backdrop's). Visually confirmed by the user: dark backdrop behind,
Burden 17% + vertical bar + Contents-of-Backpack + full item grid all visible.
Build + App(532)/Core(1526) tests green.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
