docs/bench: iris's first phone report, before the phone fixes

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

docs/bench/iris-phone-2026-09-06-before-fixes.md

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+# iris bench report from Iris's phone, 2026-09-06, before the phone fixes
+
+Build 46246ea (Vulkan, bench v1: 24-swipe scroll loop then 400 streamed
+events), run by Iris on her Pixel 9 Pro XL before the first-touch wipe,
+the missing bold faces, the density scale and the status-bar inset were
+fixed -- so the rows were drawn at roughly a third of their intended size
+and the run may have included frames after the wipe. Preliminary, kept
+because it is the first iris number from real hardware. Compare with
+`compose-phone-2026-09-06.md`, taken on the same phone with the same
+fixture and gesture loop.
+
+Reading it: the phone is 120 Hz (8.3 ms budget). `janky%` here counts
+frames over 16.7 ms, so it is not Compose's `late` (over 8.3 ms). Like for
+like: iris p50 6.2 ms vs Compose 7.7 ms; p90 32.0 vs 29.2; p99 42.1 vs
+41.1. `cpu_p50=4.7ms` is iris's own per-frame CPU work on the phone,
+against 0.2-0.4 ms on the emulator's x86 cores. Process CPU 15.6 s vs
+20.9 s, but over a shorter run (692 frames vs 1613 -- iris only renders on
+change and had no fling settle time), so per-second CPU is not directly
+comparable; peak RSS 365 MB vs 587 MB. Battery current mean 563 mA vs
+419 mA is the one figure that reads worse, and it is the least
+comparable: 22 samples vs 39, over runs of different length and different
+idle share. Bench v2's per-phase accounting is what makes these comparable.
+
+```
+iris bench report
+frames=692 janky%=32.37 p50=6.2ms p90=32.0ms p99=42.1ms worst=52.6ms (measures redraw-start to after present() is called, not GPU/compositor completion) cpu_p50=4.7ms gpu_wait_p50=1.3ms (redraw-start-to-submit vs. submit-to-after-present)
+  scroll: 6 cycles (24 swipes), streamed 400/400 fixture events
+  process CPU time over this run: 15554ms
+  peak RSS: 365328kB
+  battery current: mean -563493µA over 22 samples (min -1807812, max -132812)
+```