iris: rebuild with bundled fonts, content-scale fix, and a Diagnostics control

Iris's first real-phone report on the previous rebuild found the top
buttons and text rendering fine before any touch, but four defects on
interaction: every glyph vanishing on the first tap or scroll (not
root-caused this pass -- diagnostics added to catch it next report),
bold words rendering as blank gaps (fixed: bundled static Noto Sans/Noto
Sans Mono faces), text far too small (fixed: density-based scaling,
missing on both platforms before this), and the top row sitting under
the status bar (fixed: a new insets hook). Full account in ai-app-2's
docs/RUST.md P0 box.

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

README.md

@@ -129,3 +129,25 @@ Two things changed:
 
 If this rebuild still crashes, the on-screen report from point 1 names the real cause directly;
 paste it back rather than guessing further from a truncated log.
+
+## 2026-09-06, later: bundled fonts, content-scale fix, Diagnostics control
+
+Iris's first real-phone report on the previous rebuild (no crash) found four
+defects the emulator never showed: every glyph disappearing on the first tap
+or scroll (rectangles stay drawn -- not root-caused this pass, but a phone
+report from this build's new Diagnostics page would help), bold words
+rendering as blank gaps (fixed -- bundled Noto Sans/Noto Sans Mono, static
+per-style faces, ahead of the platform's own fonts), text far too small
+(fixed -- iris had no device-pixel-ratio handling on either platform before
+this; density now divides window size, touch coordinates and the shader's
+window uniform down to logical units), and the top buttons sitting under the
+status bar (fixed -- a new `AndroidAppState::on_insets_changed` hook, unused
+until now).
+
+This build also adds a third **Diagnostics** button next to Run/Copy,
+filling the report area with adapter identity, font resolution, the atlas's
+view count, every wgpu error seen since surface creation, and the frame
+report -- "copy this and send it to Iris" via the existing Copy button.
+
+Full account, including what's still unverified on a real phone, in
+`docs/RUST.md`'s P0 box in the `ai-app-2` repo (`rustify` branch).