Add SPA session validation and buglist, update migration docs

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

node_modules/playwright-core/bin/install_webkit_wsl.ps1

@@ -1,7 +1,5 @@
 $ErrorActionPreference = 'Stop'
 
-# WebKit WSL Installation Script
-# See webkit-wsl-transport-server.ts for the complete architecture diagram.
 # This script sets up a WSL distribution that will be used to run WebKit.
 
 $Distribution = "playwright"
@@ -25,9 +23,9 @@ if [ ! -f "/home/$Username/node/bin/node" ]; then
   mkdir -p /home/$Username/node
   curl -fsSL https://nodejs.org/dist/v22.17.0/node-v22.17.0-linux-x64.tar.xz -o /home/$Username/node/node-v22.17.0-linux-x64.tar.xz
   tar -xJf /home/$Username/node/node-v22.17.0-linux-x64.tar.xz -C /home/$Username/node --strip-components=1
+  sudo -u $Username echo 'export PATH=/home/$Username/node/bin:\`$PATH' >> /home/$Username/.profile
 fi
 /home/$Username/node/bin/node cli.js install-deps webkit
-cp lib/server/webkit/wsl/webkit-wsl-transport-client.js /home/$Username/
 sudo -u $Username PLAYWRIGHT_SKIP_BROWSER_GC=1 /home/$Username/node/bin/node cli.js install webkit
 "@ -replace "\r\n", "`n"