Camera RAW import through LibRaw with a develop sheet (12.6a)

TASKS.md

@@ -330,7 +330,11 @@ The panel of 4.6 shows and edits what the session holds so far. Each item adds i
 - 12.5b round 1: FAIL, two findings. The notes TASKS.md 12.0 assigned here were unwritten: Swift agrees since 1.2.0 on Levels' soft edges (`f6a74c9`), effects through snapshots (`5775dd1`, `6230e41`), Color Dodge and Burn in sRGB (`121a15f`), M and L (`b5cb4fa`) and Select All (`90ee29f`), each note now saying so; the signal record lacked `smoothing` (read now).
 - 12.5b round 2: FAIL, two findings. Select ▸ All rested without a canvas where Swift 1.2.0's never rests (`90ee29f`): the entry is always enabled now and selects a focused field's text (tested); the 9.4a note on Swift's Gaussian test was stale since `7c4512a` (says so now). With them, as `7c4512a` did, the invert test lost its wall-clock budget, which measured the parallel suite's load.
 - 12.5b round 3: FAIL, one finding, the third and last round. With the layer list focused, Swift 1.2.0's Select All reaches its table, which selects every row with the top one primary; the twin selected the canvas. Fixed after the round: a focused list takes Select All (`NativeLayerList::selectAllRows`), tested, its two mutants caught (`mut-12.5b-r3.log`); the item closes on that, the review's three rounds spent.
-- [ ] 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`.
+- [x] 12.6a Version 1.2.1, part one: camera RAW import through LibRaw with its develop sheet.
+- 12.6a round 1: FAIL, seven findings. The cached LibRaw read its own last multipliers and halved size (the camera's now come from unpack's copy, `rawdata`); the tint's sign was the inverse of Adobe's (positive is a greener white now, D65 reads +9.5); `adjust_maximum_thr` stretched frames near white (off); a white the camera cannot see was dropped by LibRaw in silence (refused); dcraw's normalization by the smallest multiplier moved brightness with temperature (anchored on green); a test comment was wrong.
+- 12.6a round 2: FAIL, two findings. Unclipped highlights (round 1's anchor through `highlight` 1) turned magenta on real cameras: LibRaw clips again and the twin multiplies the smallest multiplier back, a clipped frame tested white; the refused white said Swift's words for a wrong file type: it is `ImageImportError(whiteBalance)` with words of its own.
+- 12.6a round 3: PASS. One wording note taken (the frame's white at the slider's ends).
+- [ ] 12.6b Version 1.2.1, part two: middle-button pan, persistent tool settings, Auto Select picking the foreground layer, the reshaped app icon (`45ab8fd`) in `packaging/icons`.
 - [ ] 12.7 Version 1.2.2: Photoshop's remaining blend modes in its groups; Black & White, Color Balance and Invert adjustments.
 - [ ] 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, its grading wheels turning the way their hue runs (1.2.9's `96edd5f`).