Address CodeRabbit review: scope the Gaussian Blur speedup claim

The uncancelled speedup is for layers with locked transparency only, the
numbers are local runs and the perf baseline is not re-measured yet.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs/gaps.md

@@ -1,6 +1,6 @@
 # Where PhotoCraft falls short of Photoshop
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-18 · **Change:** minor (G9: fill and adjustment layers copy and paste whole, #2344; G2: a cancelled 24 MP Gaussian Blur job stops in at most 44 ms, P25 under its 200 ms budget, #6205; G1: smart filter masks show on PSD open, Photoshop-oracle floor 188/258; G10: DPX read and write, #1049, Cineon read; G1: CMYK Hue/Saturation and Color Balance keep the black ink; G1: CMYK Posterize on the stored values, psd-tools oracle floor 242/309; G1: CMYK adjustment layers composite on the document's inks, Photoshop-oracle floor 165/258; G1: CMYK Brightness/Contrast on the inks, CMYK Threshold's luma; G1: modern Brightness/Contrast's brightness curve matches Photoshop, Photoshop-oracle floor 151/258; G1: Lab documents composite on their stored L, a, b, Photoshop-oracle floor 152/258; G1: Levels on whole levels at every step, Photoshop-oracle floor 146/258, psd-tools 238/309; G1: 32-bit Brightness/Contrast legacy, Channel Mixer, Photo Filter and Black & White tint unclipped as in Photoshop, Photoshop-oracle floor 149/258; G1: mask feathers blur with their exact variance, psd-tools oracle floor 240/309; G1: Threshold splits on Photoshop's luminosity, psd-tools oracle floor 241/309; G1: pass-through clipping base with an adjustment renders isolated, psd-tools oracle floor 240/309; G1: 16-bit Posterize as Photoshop bins it, psd-tools oracle floor 241/309; G1: Gradient Map driven by the W3C luminosity, Photoshop-oracle floor 147/258; G7: Field Blur's on-canvas pins, #3373; G4: Hue Jitter amount track, #3825 partial; G4: minimum field interaction, #3825 partial; G1: CMYK Invert, Posterize and Threshold on the inks, 16-bit Lab Invert; Photoshop-oracle floor 145/258; G11: `.atn` import maps 112 events: Select and Mask, Filter Gallery Spatter, Ripple, Crystallize, Pattern Fill layers, mask targeting, Step Backward, nudges in points, Bitmap mode; G5: Free Transform H/V skew fields; G9: toolbar tool shortcut editing; refreshed against main: G2, G5, G7, G9, G10, G13, G14, G17 items that landed; G10: DPX read and write, #1049; G4: checkbox-only Brush Settings rows; G11: Load/Save Actions `.atn` landed, AUTO-219-2 partial; G5: hold-a-key spring-loaded tools landed, #2672; G1: #2465 fixed; stale missing-tool rows corrected: Color Replacement, Red Eye and Add/Delete Anchor Point are live tools, so only Art History Brush is missing; no estimate changed) · **Target:** Adobe Photoshop 2026
+> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-18 · **Change:** minor (G9: fill and adjustment layers copy and paste whole, #2344; G2: a cancelled 24 MP Gaussian Blur job stops in at most 44 ms, P25 under its 200 ms budget in local runs, baseline not re-run, #6205; G1: smart filter masks show on PSD open, Photoshop-oracle floor 188/258; G10: DPX read and write, #1049, Cineon read; G1: CMYK Hue/Saturation and Color Balance keep the black ink; G1: CMYK Posterize on the stored values, psd-tools oracle floor 242/309; G1: CMYK adjustment layers composite on the document's inks, Photoshop-oracle floor 165/258; G1: CMYK Brightness/Contrast on the inks, CMYK Threshold's luma; G1: modern Brightness/Contrast's brightness curve matches Photoshop, Photoshop-oracle floor 151/258; G1: Lab documents composite on their stored L, a, b, Photoshop-oracle floor 152/258; G1: Levels on whole levels at every step, Photoshop-oracle floor 146/258, psd-tools 238/309; G1: 32-bit Brightness/Contrast legacy, Channel Mixer, Photo Filter and Black & White tint unclipped as in Photoshop, Photoshop-oracle floor 149/258; G1: mask feathers blur with their exact variance, psd-tools oracle floor 240/309; G1: Threshold splits on Photoshop's luminosity, psd-tools oracle floor 241/309; G1: pass-through clipping base with an adjustment renders isolated, psd-tools oracle floor 240/309; G1: 16-bit Posterize as Photoshop bins it, psd-tools oracle floor 241/309; G1: Gradient Map driven by the W3C luminosity, Photoshop-oracle floor 147/258; G7: Field Blur's on-canvas pins, #3373; G4: Hue Jitter amount track, #3825 partial; G4: minimum field interaction, #3825 partial; G1: CMYK Invert, Posterize and Threshold on the inks, 16-bit Lab Invert; Photoshop-oracle floor 145/258; G11: `.atn` import maps 112 events: Select and Mask, Filter Gallery Spatter, Ripple, Crystallize, Pattern Fill layers, mask targeting, Step Backward, nudges in points, Bitmap mode; G5: Free Transform H/V skew fields; G9: toolbar tool shortcut editing; refreshed against main: G2, G5, G7, G9, G10, G13, G14, G17 items that landed; G10: DPX read and write, #1049; G4: checkbox-only Brush Settings rows; G11: Load/Save Actions `.atn` landed, AUTO-219-2 partial; G5: hold-a-key spring-loaded tools landed, #2672; G1: #2465 fixed; stale missing-tool rows corrected: Color Replacement, Red Eye and Add/Delete Anchor Point are live tools, so only Art History Brush is missing; no estimate changed) · **Target:** Adobe Photoshop 2026
 
 Every known shortfall against Photoshop 2026 (27.11.0), one entry each, ranked by user impact
 on the way to beta. This is the work list agents pick from: take the highest-ranked entry that
@@ -219,8 +219,11 @@ what an agent can't finish alone.
 - **Measured progress (2026-10-15):** P25, cancelling a Gaussian Blur r 50 job on 24 MP, stops
   within 13–44 ms max over five runs (was 337–399 ms; budget 200 ms): the transparency-lock
   pass that puts a Background's alpha back now runs per tile in parallel and checks for
-  cancellation, and column-strip box passes check between passes. The uncancelled job is
-  ~40% faster (p50 about 690 → 400 ms). #6205.
+  cancellation, and column-strip box passes check between passes. On a layer with locked
+  transparency (a Background) the uncancelled job is ~40% faster (p50 642–735 → 395–409 ms);
+  other layers gain only the strip checks. Local runs, `perf/baseline.json` not re-measured yet
+  (the scorecard still shows P25 as not run); command, revision, machine and per-run numbers in
+  #6206. #6205.
 - **Missing:** 22 of 25 budgeted scenarios are over budget (baseline 2026-10-05, a heavily
   loaded machine): layer move with styles 321 ms p50 against 25 ms, opacity change 276 ms
   against 20 ms, paste 12 MP 1.2 s against 100 ms, layer move on 15000×10000 16-bit 2.7 s,
@@ -281,7 +284,7 @@ what an agent can't finish alone.
 |---|---|---|
 | 2026-10-15 | minor | G1 / #5972 A1: render only provably constant-RGB `GdFl` noise fills; variable noise synthesis remains open |
 | 2026-10-18 | minor | G9: with no selection, Copy takes fill and adjustment layers whole and Paste recreates them (#2344); UI-217-23 stays partial (a single pixel layer copies its pixels only); estimate unchanged |
-| 2026-10-15 | minor | G2: a cancelled 24 MP Gaussian Blur job stops within 44 ms max (P25, budget 200 ms; was about 400 ms), the uncancelled job about 40% faster; #6205 |
+| 2026-10-15 | minor | G2: a cancelled 24 MP Gaussian Blur job stops within 44 ms max (P25, budget 200 ms; was about 400 ms; local runs, baseline not re-run), the uncancelled job on a locked-transparency layer about 40% faster; #6205 |
 | 2026-10-14 | minor | G1: a PSD smart object's filter mask shows when the file opens (Photoshop stores the filtered pixels unmasked); export stores them that way too; Photoshop-oracle floor 185 → 188 of 258 |
 | 2026-10-13 | minor | G14: D90 image area measured (4288 × 2848 at (10, 10)); gap remains open |
 | 2026-10-14 | minor | Corpus floors raised to the measured results of the CMYK, Lab, 32-bit, Levels, Threshold, Posterize, feather and pass-through fixes landed together: Photoshop-authored 165 → 185 of 258, io 146 → 148 of 170, psd-tools 242 → 249 of 309 |