docs: masks with a shape (LAYOUT.md, decided 2026-09-07) and the orchestrator queue in RUST.md

Iris: masks should carry a shape, rounded rectangle first, or take a
container widget as the mask, with corner alpha multiplied rather than
cut. Design: the mask evaluates the same SDF draw_rounded_rect uses,
nested masks chain and multiply like moves, and a rounded Rect's
.masked() makes the container the mask with one radius by construction.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

docs/RUST.md

@@ -43,6 +43,25 @@ gated on her verdict**, so this pass works the P0 defects and the pure
 prerequisites in this order. Each item is ticked here by the agent that
 closes it.
 
+### Queue, 2026-09-07 (orchestrator)
+
+In order; two builders at a time. Each is ticked here by the agent that
+closes it.
+
+- [ ] Test rig, layers 1 and 2 ("Three test layers" below). Running.
+- [ ] Fling parity with Compose, and the phone's keyboard push-up, with
+  insets shown in the diagnostics overlay. Running, in a worktree.
+- [ ] Phone logging through Dev Updater (Iris has no logcat; see
+  docs/TODO.md and the memory note): research how Dev Updater shows an
+  app's runtime log, design the smallest route (the app keeps its own
+  recent log; a debug button copies it; Dev Updater reads it), write
+  the decision in docs/DECISIONS.md, build it.
+- [ ] Masks with a shape -- docs/LAYOUT.md "Masks with a shape (decided
+  2026-09-07)". Rounded masks through the `Rect` SDF, chained and
+  multiplied, the container as the mask.
+- [ ] Compose app: the `Reversed range` crash in `ToolInput.highlighted`
+  (docs/TODO.md). Main branch, not rustify.
+
 ### Desktop and phone share the code (Iris, 2026-09-07)
 
 Iris plans to develop a desktop app as well, and asked that most code be