Document separate benchmark publication repo

docs/RUST.md

@@ -788,7 +788,13 @@ device.
       no server, driving the same scroll loop and streaming phase, and
       printing the same report fields. AGENTS.md's "The rigs" is the
       current description; `app-rust/build-apk.sh` and `run-bench.sh` are
-      how it is run.
+      how it is run. The build source is this repository, but the Dev Updater
+      publication is the separate `~/repos/ai-app-bench` repository, whose
+      `iris-bench` component serves a committed APK with no build step. After
+      an arm64 release build, replace its
+      `iris/build/outputs/apk/release/iris-bench-arm64.apk` and push that
+      repository; adding the component here or pushing only `ai-app-2` is the
+      wrong delivery path.
 
 - [ ] **P1 — session screen parity.** **Started 2026-09-06, on Iris's
       word**: "just continue with the plan for now; try to move towards