feat(test): configure vitest projects for monorepo coverage

Refactor vitest configuration to use v4's projects feature for
unified monorepo test execution and coverage reporting.

Changes:
- Add projects configuration with 'root' and 'examples' workspaces
- Simplify package.json test scripts (remove test:submodules, test:root)
- Extend coverage.include to capture examples/**/*.ts files
- Enable automatic test discovery in examples when tests are added

This allows running all tests across the monorepo with a single
'pnpm test' command and generates unified coverage reports that
include both src and examples directories.

Author: ryoppippi

package.json

@@ -27,9 +27,7 @@
     "lint:knip": "knip",
     "preinstall": "npx only-allow pnpm",
     "prepack": "npm pkg delete scripts.preinstall && pnpm run build",
-    "test": "pnpm --aggregate-output run '/^test:/'",
-    "test:submodules": "pnpm --parallel -r --aggregate-output test",
-    "test:root": "vitest",
+    "test": "vitest",
     "coverage": "vitest run --coverage",
     "typecheck": "pnpm --aggregate-output run '/^typecheck:/'",
     "typecheck:submodules": "pnpm --parallel -r --aggregate-output typecheck",

vitest.config.ts

@@ -4,23 +4,41 @@ export default defineConfig({
   test: {
     watch: false,
     globals: true,
-    include: ['src/**/*.spec.ts', 'scripts/**/*.spec.ts'],
-    exclude: ['node_modules', 'dist', 'examples', 'src/toolsets/tests/stackone.mcp-fetch.spec.ts'],
-    setupFiles: ['./vitest.setup.ts'],
     testTimeout: 30000,
     coverage: {
       provider: 'v8',
       reporter: ['text', 'json', 'html'],
-      include: ['src/**/*.ts'],
-      exclude: ['src/**/*.spec.ts', 'src/**/tests/**'],
+      include: ['src/**/*.ts', 'examples/**/*.ts'],
+      exclude: ['**/*.spec.ts', '**/*.test.ts', '**/*.test-d.ts', '**/tests/**'],
     },
+    projects: [
+      {
+        extends: true,
+        test: {
+          name: 'root',
+          root: '.',
+          include: ['src/**/*.spec.ts', 'scripts/**/*.spec.ts'],
+          exclude: ['node_modules', 'dist', 'examples', 'src/toolsets/tests/stackone.mcp-fetch.spec.ts'],
+          setupFiles: ['./vitest.setup.ts'],
+          typecheck: {
+            enabled: true,
+            include: ['src/**/*.spec.ts', 'src/**/*.test-d.ts'],
+          },
+        },
+      },
+      {
+        extends: true,
+        test: {
+          name: 'examples',
+          root: './examples',
+          include: ['**/*.spec.ts', '**/*.test.ts'],
+          exclude: ['node_modules', 'dist'],
+        },
+      },
+    ],
     deps: {
       interopDefault: true,
     },
-    typecheck: {
-      enabled: true,
-      include: ['src/**/*.spec.ts', 'src/**/*.test-d.ts'],
-    },
   },
   resolve: {
     conditions: ['import', 'module', 'default'],