Export failure tests limit only the panel's accept; margin measured (12.8d)

TASKS.md

@@ -350,7 +350,8 @@ The panel of 4.6 shows and edits what the session holds so far. Each item adds i
 - [x] 12.8a Version 1.2.3, part one: the Camera Raw filter's model and pixel kernels.
 - [ ] 12.8b Version 1.2.3, part two: the Camera Raw panel beside the canvas (Swift's docked placement in `FloatingPanel.swift`), its grading wheels turning the way their hue runs (1.2.9's `96edd5f`), the Filter menu's entry, and the canvas half of the tools in `EditorCanvas.swift` (the readout on hover and its clearing on leaving, the three eyedroppers and the guide's press, each refocusing the panel, the guide and targeted drags, their release, `picking`'s four terms).
 - [ ] 12.8c Version 1.2.3, part three: Inner Glow, Image Trim, blur and noise adjustment layers, the layer context menu without 1.2.5's dropped Layer Effects entry (`5d7adba`).
-- [ ] 12.8d A `std::bad_alloc` escapes a catch in `ProjectExportFailureTests::aJPEGRenderThatFindsNoMemoryIsExplained` under a parallel run (seen twice, 12.7b and 12.8a; alone it passes ten times of ten): find the throw and catch it where the house rule says.
+- [x] 12.8d A `std::bad_alloc` aborted `ProjectExportFailureTests` under a parallel run (seen in 12.7b and 12.8a; alone it passed ten of ten): the panel tests held a memory limit while dialogs painted, and the panel limits sat at the edge of what the panel and its snapshot need.
+- 12.8d round 1: PASS. Its notes taken: the snapshot's measured peak named in AGENTS.md, `malloc_trim` in `limited` named equivalent.
 - [ ] 12.9 Version 1.2.4: the finishing filters, stepped keyboard zoom, a steady tool rail and tab strip, the project format's version in one place.
 - [ ] 12.10 Versions 1.2.5–1.2.7: copying and pasting whole layers within and between projects, duplicating every selected layer, crop ratios 3:4 and 9:16 and a crop that starts at the selection, Vignette's defaults, text colour previews.
 - [ ] 12.11 Versions 1.2.8–1.2.10: the document's own pixel budget, PSB, simple Photoshop text as editable text, background-only PSDs, oversized Photoshop layers cropped, clicked text starting on its first baseline, live text opened by a double click with the Move tool (`a5721b2`), marching ants at screen resolution, SVG import (Qt SVG).