docs: record the phone-report fixes, follow-ups and the bundled-font API

RUST.md's P0 box gets Iris's first real-phone report (no crash) and the
four defects it found (glyph-wipe-on-first-touch, missing bold glyphs,
text far too small, status-bar inset not applied), what was fixed and
how it was verified on the emulator, and what's still open (item 1's
root cause, and the top-row height anomaly noted in the last commit).

IRIS_TODO.md gets a new "From the phone, 2026-09-06" section for the two
items explicitly deferred to a follow-up agent: no scroll momentum/fling,
and occasional jitter scrolling down.

IRIS.md gets the public-API entry for TextData's bundled fonts/
font_diagnostics, UiRenderNode::new/resize's new window_size parameter,
AndroidUiState::content_scale, AndroidAppState::on_insets_changed, and
iris_core::WgpuErrorLog.

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

docs/IRIS_TODO.md

@@ -117,6 +117,28 @@ order and what "done" looks like. Tick and date them in place.
   screen wants the same thing (P1's own transcript rows already read
   their content from a `TextEdit` for the same reason).
 
+## From the phone, 2026-09-06
+
+Found on Iris's own phone while working RUST.md's P0 box's phone-report
+follow-ups. Recorded here rather than fixed in that pass, so a follow-up
+agent takes them without colliding with that pass's `bench_client.rs`/
+`android/view.rs`/`android/sense.rs` changes.
+
+- [ ] **Swiping has no momentum.** iris's `List` pans exactly as far as the
+  finger moves and stops dead on release -- unlike Compose, which flings
+  and decelerates. Needs velocity tracking over the last several move
+  samples and an Android-style decelerating fling, cancelled by the next
+  touch-down, redrawing every frame until it settles. `BenchRun.kt`'s own
+  fling phase (RUST.md's "Benchmark v2" box) is the reference shape:
+  "travel way faster... which is better for stress testing."
+- [ ] **Scrolling down sometimes jitters the text.** Two named suspects,
+  neither confirmed: `DragArbiter`'s slop being released as one jump
+  (`iris/src/sense.rs`), or a per-frame pan delta applied a frame late.
+  Measure by tracing the list's scroll offset per frame against a
+  monotonic synthetic drag, the same way `iris/android-app/trace-draw.sh`-
+  style instrumentation traced the touch-scroll dropout in RUST.md's I5
+  box -- not by eyeballing a screenshot.
+
 ## Build
 
 - [x] **Benchmarks**, not unit tests, run on demand (2026-09-05; a