Magic tool Object mode (Compositor 1.1.8)

TASKS.md

@@ -317,7 +317,10 @@ The panel of 4.6 shows and edits what the session holds so far. Each item adds i
 - 12.3b work: the rulers beside the canvas (corner, strips, ticks and labels, drags that make and drop guides), the grid and guides drawn over the canvas, guide drags with the Move tool (cursor, Escape, rests for wheels and pinches, lost releases). Evidence: every test green in the dev image, lint clean; mutants over the rulers, the overlay, the canvas's drags, keys, cursor and repaint, and the layout: all caught but the equivalent one AGENTS.md names.
 - 12.3b round 1: FAIL, three findings. Six drawn details passed their tests broken: the ruler's half-step tick, its labels' place, presence and gray, the guides' hairline width, the grid majors' ink, and Escape taking a guide drag ahead of an open transform edit (each pinned now, its mutant caught); a screenshot two tests saved in the working directory (they save beside the test binary now, the stray file removed); a no-op assertion (gone).
 - 12.3b round 2: PASS, no findings.
-- [ ] 12.4 Version 1.1.8: the Magic tool's Object mode (U²-Net and the clicked region).
+- [x] 12.4 Version 1.1.8: the Magic tool's Object mode (U²-Net and the clicked region).
+- 12.4 work: Object mode (U²-Net regions on the model grid, the guided edge, edge steps, smoothing), the session call, W and Tab, the Magic bar (modes, source, a signed Edge field), the canvas press and cursor, the rail icon and hints. Evidence: every test green in the dev image, lint clean; statement deletion over `ObjectSelection.cpp` and targeted mutants over the model, session, bar, canvas, list, hints, wand landing and icons: all caught but the equivalents AGENTS.md names.
+- 12.4 round 1: FAIL, five findings. A trace the wand kernel refuses left the Object worker uncaught and aborted the app (the worker catches `MagicWandError` now; no test reaches it, named in AGENTS.md); three details passed their tests broken: the press handing the view point on (the click now lands through a zoom), the cell row read through the width (a disc low on a 4:3 picture now), the bounds rounding where Swift floors (a click in the last half pixel now), and a minus after a digit (typed now); the icon sheet saved in the working directory (beside the binary now, the stray file gone); Qt's repeated start counted toward three points (dropped first now, Swift's later drops and Chaikin's guard dead and gone); the signal record lacked the mode and settings (read now).
+- 12.4 round 2: PASS. Its residuals: the three-point threshold named equivalent in AGENTS.md; the launch test's screenshot now saved beside its binary, the same cause as the icon sheet.
 - [ ] 12.5a Version 1.2.0, part one: Photoshop PSD import (the reader, channel coder, vectors, document builder, the conversion report sheet).
 - [ ] 12.5b Version 1.2.0, part two: the Outer Glow effect, brush Smoothing, and the release's other changes to what the twin holds.
 - [ ] 12.6 Version 1.2.1: camera RAW import through LibRaw with its develop step, middle-button pan, persistent tool settings, Auto Select picking the foreground layer, the reshaped app icon (`45ab8fd`) in `packaging/icons`.