feat(wasm-eh): migrate the WASM build to native wasm exceptions (+ 3D viewer default-on)

Replace the legacy Emscripten JS-exceptions model with native wasm-EH (legacy
encoding) across the whole build, keeping Asyncify coroutines working via a
from-source Binaryen --hoist-cpp-catches pre-pass. Net result: native-EH is the
only build mode, the 3D viewer is on by default, and pcbnew shrinks substantially.

Highlights:
- Binaryen submodule everywhere + --hoist-cpp-catches integration in apply-asyncify;
  post-link Asyncify covers every app wasm (not just standalone test wasm).
- Build deps (incl. OpenCASCADE without OCC_CONVERT_SIGNALS) and all KiCad apps
  with -fwasm-exceptions; emscripten_sleep added to the post-link asyncify-imports.
- libcontext fiber entry wired under native exceptions; while-loop main loop +
  currData shim injected into all wx apps.
- Native-EH collab apply fixed: DEBUG-define the embind TU + match all out-of-CMake
  C++ TUs' ABI flags to the core, fixing the vtable-layout skew / mis-dispatch.
- 3D viewer enabled by default (real raytracer linked, not the stub).
- Retire the EH-spike scaffolding; flip the asyncify-races ablation pins to
  shim-redundancy pins (native-EH stays clean with the legacy shims ablated).
- Fix the asyncify-races quiescence check to not require Asyncify.currData==0:
  under the native-EH per-frame-yield top loop the main stack is asyncify-suspended
  every frame, so currData legitimately churns (a freed-but-not-yet-nulled buffer,
  not a leak). Refresh the pcbnew toolbar screenshot baseline for the new kicad.
- CI: drop the obsolete binaryen_version input/env (the build uses the binaryen
  submodule fork's wasm-opt, not a version download); key the wasm-output cache on
  the binaryen submodule SHA instead.

Bumps the wxwidgets + binaryen submodules to their squashed feature commits.

Validated green: all 7 apps native-EH (real 3D in pcbnew); KiCad e2e 63/63
Firefox + Chromium (3D viewer renders); wx 336; coroutine 34/34 both engines;
asyncify 7/7 both engines.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

scripts/common/asyncify-removelist.txt

@@ -0,0 +1,26 @@
+# Functions EXCLUDED from Asyncify instrumentation (consumed by apply-asyncify.sh unless
+# --no-removelist). These are large, NON-suspending KiCad/OpenCASCADE functions (generated resource
+# tables, wxFormBuilder UI constructors, OCC geometry) that are dense with native wasm try/catch.
+# Asyncify's per-function cost is superlinear in try-count (it builds a CFG + liveness over every
+# try), so instrumenting these few giants is what drives the multi-GB RAM blowup of `wasm-opt
+# --asyncify` on the native-EH build. They never call a suspending import, so excluding them is safe.
+#
+# MATCHING: Binaryen escapes each entry, then treats entries containing `*` as wildcard patterns
+# (String::wildcardMatch) and entries without `*` as exact escaped function names. Full demangled
+# signatures don't exact-match (subtle spacing) and a `*` inside a pointer type (e.g. wxWindow*) turns
+# the whole entry into a pattern that still misses — so use a PREFIX wildcard per symbol, which matches
+# the function's escaped demangled name regardless of argument formatting. Patterns that match nothing
+# in a given app (e.g. the OCC entries when 3D is off) just emit a harmless "non-matching" warning.
+# Only the KiCad build passes the remove-list; the small wx test apps opt out via --no-removelist
+# (and the bare name "match" could collide there).
+COLOR_SETTINGS::COLOR_SETTINGS*
+BuildBitmapInfo*
+match
+DIALOG_PAD_PROPERTIES_BASE::DIALOG_PAD_PROPERTIES_BASE*
+buildKicadAboutBanner*
+IGESToBRep_CurveAndSurface::TransferGeometry*
+StepAP214_Protocol::StepAP214_Protocol*
+BRepCheck_ParallelAnalyzer::operator*
+ShapeFix_Wire::FixGap3d*
+ShapeFix_Wire::FixGap2d*
+PCB_EDIT_FRAME::setupUIConditions*