feat: initial Lam Agent extension (#1)

vitest.config.mts

@@ -0,0 +1,21 @@
+import { fileURLToPath } from "node:url";
+import { defineConfig } from "vitest/config";
+
+/**
+ * `.mts` rather than `.ts`: this package is CommonJS (the Vicinae toolchain
+ * compiles extensions with `module: commonjs`), and Vite warns when an ESM
+ * config is loaded as CJS. The extension lets us write the config as ESM.
+ */
+export default defineConfig({
+  test: {
+    globals: true,
+    include: ["src/__tests__/**/*.test.ts"],
+  },
+  resolve: {
+    alias: {
+      // Point the API package at the in-memory stub; there is no Vicinae
+      // runtime under test.
+      "@vicinae/api": fileURLToPath(new URL("./src/__mocks__/@vicinae/api.ts", import.meta.url)),
+    },
+  },
+});