iris bench: one retained move for pinned growth (ai-app-2 fffed42)

README.md

@@ -9,8 +9,29 @@ build machine. Add this checkout as a project in Dev Updater (its
 beside the real app under their own application ids and need no server,
 no enrolment and no permissions.
 
+**This is the publication repository, not the source repository.** The iris
+APK is built from `~/repos/ai-app-2`'s `rustify` branch, copied to
+`iris/build/outputs/apk/release/iris-bench-arm64.apk` here, then committed and
+pushed on this repository's `main` branch. Dev Updater pulls this repository
+and serves that committed APK; pushing `ai-app-2` by itself publishes nothing
+to the benchmark card.
+
 The rest of this file is the runbook that was delivered with the APKs.
 
+**2026-09-09 (latest): pinned growth moves the retained transcript once.**
+`iris-bench-arm64.apk` rebuilt from ai-app-2 `fffed42`. This is the
+framework-level `LazySpan` change: when a streaming message grows and pushes
+the transcript upward, retained rows keep stable local boxes and one shared
+child-coordinate slot moves the subtree. There is no transcript-specific
+rendering shortcut.
+
+The layer-1 upload rig over 401 streamed events now reports instance uploads
+at **2.9% against a 2.9% floor**, from 71.9% against 71.8%; median instance
+upload fell from **176,496 bytes to 1,728 bytes**. Settled list movement is one
+real list draw and one shared move-slot write. The framework and app suites,
+the transcript edge/clamp tests, the arena rig, and a phone-shaped headless
+fling replay all passed before this APK was published.
+
 **2026-09-09 (later): the report itself was wrong in three places, and
 two of them were mine from this morning.** Rebuilt from ai-app-2
 `9bf714f`, iris APK only. Your run said "now THAT is smooth" and the