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/lib/mcp/test/streams.js

@@ -22,14 +22,19 @@ __export(streams_exports, {
 });
 module.exports = __toCommonJS(streams_exports);
 var import_stream = require("stream");
+var import_util = require("../../util");
 class StringWriteStream extends import_stream.Writable {
-  constructor(progress) {
+  constructor(output, stdio) {
     super();
-    this._progress = progress;
+    this._output = output;
+    this._prefix = stdio === "stdout" ? "" : "[err] ";
   }
   _write(chunk, encoding, callback) {
-    const text = chunk.toString();
-    this._progress({ message: text.endsWith("\n") ? text.slice(0, -1) : text });
+    let text = (0, import_util.stripAnsiEscapes)(chunk.toString());
+    if (text.endsWith("\n"))
+      text = text.slice(0, -1);
+    if (text)
+      this._output.push(this._prefix + text);
     callback();
   }
 }