* Make the Windows embedded WebView layer real
- Vendor the WebView2 SDK header and loader under third_party/webview2 (BSD-3-Clause, license preserved) so repo state alone compiles the embedded layer; a missing header is now a hard error instead of a silent stub
- Fix the conformance blockers behind the guard: a local WRL callback factory for mingw, the uncaptured bridge-handler variable, an EventToken shim, and STA COM initialization on the host thread
- Stage the arch-matched loader beside built, run, packaged, and scaffolded apps, mirror it into the npm payload, and pin the wiring with vendor and loader-layout tests
* Carry the SDK root through package shortcuts and generated builds
- packageShortcut and package-ios now pass the environ map into createPackage like the package verb, so NATIVE_SDK_PATH resolves the framework root for loader staging from standalone binaries
- Generated frontend builds export NATIVE_SDK_PATH on the package command and stage the loader dir on the dev command's PATH, mirroring the SDK-dependency graph
Chris Tate
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