Merge upstream/main (#2710 one test binary per crate, #2713) into round3a-integration

Conflicts:
- xtask/src/main.rs: upstream's runners (cargo test or nextest, no
  examples, doctests apart, one wasm `cargo check --keep-going`) with
  #2302's `ci --quick` on top: test_selected builds the same targets
  (--lib --bins --tests), the wasm check takes the changed crates in one
  call, the full test step is upstream's.
- apps/lightcraft/src/control_server.rs: upstream's `before` closure, with
  the batch's no-delay sockets kept.
- docs/parity-checklist.md: LR-BEHAV-ACCESS from main (tests/it path),
  LR-BEHAV-LOCALE / LR-BEHAV-LOCALIZE from the batch (Polish).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

crates/gpu/src/ctx.rs

@@ -118,7 +118,9 @@ impl Drop for Buf {
         let mut b = Some(b);
         let _ = RETIRED.try_with(|r| r.0.borrow_mut().extend(b.take()));
         match b {
-            Some(b) => std::mem::forget(b),
+            // Leaking is deliberate during thread teardown — dropping a wgpu buffer whose device
+            // thread-locals have already gone can abort the process. The device owns it.
+            Some(b) => std::mem::forget(b), // NOSONAR
             None => {
                 RETIRED_BYTES.fetch_add(size, Ordering::Relaxed);
             }