T19: reviewed, ticked

TASKS.md

@@ -49,7 +49,7 @@ Progress truth. Top to bottom, one at a time. A task is ticked only after its co
 
 ## 11. Background blur
 
-- [ ] T19 macOS and Windows: `Blurred` or `Transparent` or `Opaque` from settings, applied live.
+- [x] T19 macOS and Windows: `Blurred` or `Transparent` or `Opaque` from settings, applied live.
 - [ ] T20 Wayland: `ext_background_effect_v1` on the window's surface.
 - [ ] T21 X11: `_KDE_NET_WM_BLUR_BEHIND_REGION` on the window.
 

tasks/reviews.md

@@ -95,3 +95,7 @@ Each task gets at most three codex rounds. Each round: the commit, the verdict,
 ## T18
 
 - Round 1, 764ff45: PASS.
+
+## T19
+
+- Round 1, c98bbad: PASS.