Add autonomous webhooks and dynamic WebView discovery

native/build_webhook.cmd

@@ -0,0 +1,9 @@
+@echo off
+setlocal
+rem Run in an x64 MSVC Native Tools prompt.
+if "%~1"=="" (set "PROBE_OUT=%~dp0build") else (set "PROBE_OUT=%~f1")
+if not exist "%PROBE_OUT%" mkdir "%PROBE_OUT%"
+pushd "%PROBE_OUT%"
+cl /nologo /O2 /MT /EHsc /std:c++17 /LD "%~dp0webhook_probe.cpp" /Fe:webhook_probe.dll /link windowsapp.lib user32.lib winhttp.lib
+if errorlevel 1 exit /b 1
+popd