fix: use vitest aliases for @braintrust/browser bundler plugins instead of workspace dep

Adding @braintrust/browser as a devDep of braintrust created a circular dependency
detected by Turborepo. Instead, alias the three bundler subpaths directly to their
TypeScript source files in integrations/browser-js/src/bundler/ within vitest.config.js.
Also alias braintrust/auto-instrumentation-configs to the workspace source to bypass
the stale npm v3.0.0-rc.29 copy in integrations/browser-js/node_modules.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: Qard

js/package.json

@@ -153,7 +153,6 @@
     "ai": "^6.0.0",
     "async": "^3.2.5",
     "autoevals": "^0.0.131",
-    "@braintrust/browser": "workspace:*",
     "cross-env": "^7.0.3",
     "dc-browser": "^1.0.3",
     "eslint-plugin-node-import": "^1.0.5",

js/vitest.config.js

@@ -15,8 +15,23 @@ const config = {
     alias: {
       // Prevent resolution into vendor directories
       vendor: false,
-      // Force braintrust subpath imports to resolve to the workspace source,
-      // not the stale npm version pinned in integrations/browser-js/node_modules.
+      // Alias @braintrust/browser bundler subpaths to source files to avoid a
+      // circular workspace dependency (braintrust -> @braintrust/browser -> braintrust).
+      "@braintrust/browser/esbuild": path.resolve(
+        __dirname,
+        "../integrations/browser-js/src/bundler/esbuild.ts",
+      ),
+      "@braintrust/browser/vite": path.resolve(
+        __dirname,
+        "../integrations/browser-js/src/bundler/vite.ts",
+      ),
+      "@braintrust/browser/rollup": path.resolve(
+        __dirname,
+        "../integrations/browser-js/src/bundler/rollup.ts",
+      ),
+      // Redirect braintrust subpath import used by the browser bundler plugin to the
+      // workspace source, bypassing the stale npm v3.0.0-rc.29 copy in
+      // integrations/browser-js/node_modules (which predates this export).
       "braintrust/auto-instrumentation-configs": path.resolve(
         __dirname,
         "src/auto-instrumentations/index.ts",