iris bench: icons from iris's own Nerd Fonts subset (ai-app-2 8dc1e05)

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

README.md

@@ -11,8 +11,9 @@ no enrolment and no permissions.
 
 The rest of this file is the runbook that was delivered with the APKs.
 
-**2026-09-08 (evening): the crash on scrolling up, and a devlog that can
-show a panic.** `iris-bench-arm64.apk` rebuilt from ai-app-2 `341b7a5`.
+**2026-09-08 (evening): the crash on scrolling up, a devlog that can
+show a panic, and icons from a font iris ships.** `iris-bench-arm64.apk`
+rebuilt from ai-app-2 `8dc1e05`.
 
 - **The crash.** The bench built a texture per disclosure triangle -- one
   per folded tool card, hundreds of copies of three pictures -- and the
@@ -33,6 +34,15 @@ show a panic.** `iris-bench-arm64.apk` rebuilt from ai-app-2 `341b7a5`.
   as the panic, replayed in order: what the app was doing, then what
   killed it, then this run. So if it still crashes, open Dev Updater's
   Runtime tab afterwards and send what is there.
+- **The disclosure triangles come from a font now.** You were right that
+  this should have been the icon font: the Compose app ships its own Nerd
+  Fonts subset and iris shipped none, so its mark was a bare Unicode
+  codepoint your phone had no face for. iris has its own subset now (992
+  bytes, three Material Design glyphs, same Mono face as the Compose
+  app's), the drawn triangle is deleted, and a missing codepoint now
+  fails a test rather than drawing nothing. If a mark is the wrong size
+  or sits wrong beside the tool name, say so -- it is a font size now, so
+  it is one number.
 - Side effect worth knowing: switching away from the app and back no
   longer re-rasterises every glyph on screen.