12.3b: rulers, the grid and guides on the canvas, guide drags (Compositor 1.1.7)

TASKS.md

@@ -313,7 +313,10 @@ The panel of 4.6 shows and edits what the session holds so far. Each item adds i
 - 12.3a work: guides in the document, undo, the store (version 8's `guides` with Swift's refusals), the resizers and the canvas flip; the layout grid; guide drags in the session with snapping; View > Show, Rulers, Snap, Snap To, Lock Guides and Clear Guides; the five shortcut definitions; moves and crops snapping through Snap To. Evidence: every test green in the dev image, lint clean; mutants over the model, the session, the store, the codec, the resizers, the flip, the projects and the menus: all caught but the two equivalent ones AGENTS.md names.
 - 12.3a round 1: FAIL, two findings. Five behaviours passed their tests broken: a guide scaled by the wrong axis (a 200 by 50 resize now), `canEditGuides`' Levels, Hue/Saturation and filter terms (each edit opened now), the five View shortcut definitions (each remapped and read back now), the grid's lines taken along the wrong edge (392 in xs, no 304 in ys), a guide cleared mid-drag still shown (tested now); each mutant is caught. `guideColor` had no reader yet: it waits for 12.3b.
 - 12.3a round 2: PASS, no findings.
-- [ ] 12.3b Version 1.1.7, part two: the rulers beside the canvas, the grid and guides drawn over it, guides dragged from the rulers and with the Move tool.
+- [x] 12.3b Version 1.1.7, part two: the rulers beside the canvas, the grid and guides drawn over it, guides dragged from the rulers and with the Move tool.
+- 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).
 - [ ] 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.