docs: tick report hygiene and bench header (commits 7485d78, b8ea723)

Both docs/IRIS_TODO.md's night bullets and docs/RUST.md's queue items
covered by the two client-core/iris-android-app commits above.

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

docs/RUST.md

@@ -719,13 +719,33 @@ closes it.
 - [ ] Catch-a-fling: down during a fling stops it at the down and drags
   with no slop (docs/IRIS_TODO.md, night). Opus, next slot; uses the
   layer-1 harness.
-- [ ] Report hygiene: ring takes Debug only from iris targets, Copy
-  report always copies and trims the log (docs/IRIS_TODO.md, night).
-  Sonnet, with the header item below (same file, `bench_client.rs`).
-- [ ] Bench app header: four controls no longer fit at 1080px and the
-  devlog agent shrank the label type 18 -> 13 to make room (UI_RULES:
-  never shrink text to fit). Put the controls in two rows or make the
-  header wrap; restore the size. Sonnet.
+- [x] **Report hygiene (done 2026-09-07).** Ring takes Debug only from
+  `iris`/`client_core` targets, Copy report always copies and trims the
+  log. `client_core::log_ring::ring_accepts` is the one filter (Info+
+  from anywhere; Debug/Trace only from this app's own targets, and only
+  while `iris::diagnostics::trace_enabled()` says tracing is on) --
+  `RingLogger` takes that as a plain `fn() -> bool` rather than depending
+  on `iris` directly, since `client-core` sits below it; `app_log.rs`
+  wires `iris::diagnostics::trace_enabled` through at install. Fixed the
+  1339-held/4050-dropped flood from `naga::front`/`wgpu_core`/`jni`
+  logging at Debug unconditionally. `bench_client.rs`'s `copy_report` no
+  longer declines when nothing has run: with no benchmark yet it copies
+  the diagnostics pane's own text instead, with a first line saying so,
+  and always appends `LogRing::tail_text(COPY_REPORT_TAIL_LINES = 150)`
+  (a first line naming how many older lines were left out) rather than
+  the whole ring. `client-core`'s tests cover the filter and the trim;
+  the copy path was checked on the emulator (immediate `Copy report` tap
+  with no prior button press now logs "copied to clipboard").
+- [x] **Bench app header (done 2026-09-07).** Four controls no longer fit
+  at 1080px at `HEADER_TEXT = 18`, and a previous agent had shrunk it to
+  13 to make room -- UI_RULES: never shrink text to fit. Restored to 18
+  and split `bench_controls` into two rows (`Dir::DOWN` of two
+  `Dir::RIGHT` pairs: run+copy, then diagnostics+trace), doubling the
+  header's own height (`HEADER_ROW_HEIGHT_DP`) rather than the outer
+  layout's reserved space, since `top_bar` sizes to its own content.
+  Checked on the emulator: `ui-trace show ... --field box` confirms two
+  clean rows with no overlap, and a screenshot shows the restored size
+  reading clearly.
 - [x] **Bench app crash-loops on this checkout's emulator (done
   2026-09-07).** Not the surface lifecycle at all, and not "once
   backgrounded" -- a build with the **default features** (no