Drop the README's note that Android reads its frame back through the CPU

"Where it stands" still named TD-1 as the one deliberate compromise worth
knowing about: the Android develop view reading its frame back through the
CPU because wgpu's swapchain tore in portrait. 0.15.0 paid that off — the
swapchain is pre-rotated and the frame reaches the compositor as a texture,
as on desktop, and architecture.md §6.1 now reads "No exceptions since
0.15.0". The release commit updated the version line above and left this
paragraph describing a state the release had just ended.

README.md

@@ -90,13 +90,6 @@ not yet for the render path, so a regression there fails nothing.
 [outstanding.md](docs/dev/outstanding.md) is the list, with the reasoning for
 each.
 
-**The one deliberate compromise worth knowing about before reading
-anything else:** the Android develop view reads its frame back through the
-CPU, because zero-copy there needs wgpu's Vulkan swapchain and that tears a
-portrait window on a tablet whose panel is mounted landscape. It is debt,
-not a revision of the rule — [technical-debt.md TD-1](docs/dev/technical-debt.md)
-has the measurements and the three things any one of which would remove it.
-
 ## Documentation
 
 [docs/README.md](docs/README.md) is the index. The short version, for someone using it: