fix: restore the production gate after the migration tasks

- rebuild editors/vscode bundles, stale since the parser escape fix
- attach the caught ParseError as `cause` in both migration validators
- drop two unused test bindings flagged by eslint

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

editors/vscode/src/language-server.cjs

@@ -1,5 +1,5 @@
 #!/usr/bin/env node
-// WRN editor language server source hash: 613d98d8154714b7e5799b02a27e16cd707a50bc2b5ae7d9fbb3f0834b9251e6
+// WRN editor language server source hash: 92a9c7cd3babafdbc518a6f20c0c8f0025e49e92a28a2fa5598c8bb7a858e800
 // WRN editor language server generator hash: f593a44aaf05495b789ce7a3086bee1eebb951b884d41c0e017bbcfe5f547e72
 // @bun @bun-cjs
 (function(exports, require, module, __filename, __dirname) {var __create = Object.create;
@@ -172043,7 +172043,7 @@ function parseHtmlView(src, pos) {
     i++;
     let value = "";
     while (i < src.length && src[i] !== quote) {
-      if (src[i] === "\\" && i + 1 < src.length) {
+      if (src[i] === "\\" && (src[i + 1] === quote || src[i + 1] === "\\")) {
         value += src[i + 1];
         i += 2;
         continue;