Prune commentary and stale Rust port notes

core/Cargo.toml

@@ -5,11 +5,7 @@ edition.workspace = true
 
 [dependencies]
 wgpu = { workspace = true }
-# Only for `UiRenderNode::new`'s `push_error_scope`/`pop_error_scope` pair
-# (renderer-creation error reporting, RUST.md's P0 phone-crash box) --
-# `block_on` turns that one async pop into the same synchronous call shape
-# `device_limits()`'s two callers already use for `request_adapter`/
-# `request_device`, rather than making this crate's one entry point async.
+# Keeps renderer creation synchronous while retrieving wgpu's async error scope.
 pollster = { workspace = true }
 bytemuck ={ workspace = true }
 image = { workspace = true }