DECISIONS.md: the summary file for choices made without Iris; RUST.md: note the two in-flight pieces

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

RUST.md

@@ -36,6 +36,14 @@ session spending an afternoon on them again.
 
 ## Where things stand (2026-09-05)
 
+- **In flight, 2026-09-05 (session cleared mid-work, picked up again):**
+  (a) the I5 touch-drag pan-vs-select gap, as a `DragArbiter` in
+  `iris/src/sense.rs` wired into `transcript-ui`'s selection; (b) E4 as a
+  new `iris/desktop-app` crate on winit, embedding `transcript-ui` via
+  `build_tree` beside a session list, with `client-core::config` holding the
+  enrolment. Design choices for both are summarised in `DECISIONS.md` at
+  the repo root, which is the file Iris reads for choices made without her.
+  Next after those: I5's Android integration and the bench numbers.
 - **Done**: E0 (toolchain), E1 (Masonry on android-view, which found the
   keyboard gap — now explained, see below), E2 (a transcript in Masonry,
   which found that Masonry has no touch-scroll on Android at all — see