feat: add client conformance testing

.github/workflows/conformance.yml

@@ -0,0 +1,24 @@
+name: Conformance Tests
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+  workflow_dispatch:
+
+jobs:
+  client-conformance:
+    runs-on: ubuntu-latest
+    continue-on-error: true  # Non-blocking initially
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 24
+          cache: npm
+      - uses: pnpm/action-setup@v4
+        with:
+          version: 10.24.0
+      - run: pnpm install
+      - run: pnpm run build:all
+      - run: pnpm run conformance:client

package.json

@@ -29,9 +29,13 @@
         "lint:all": "pnpm -r lint",
         "lint:fix:all": "pnpm -r lint:fix",
         "check:all": "pnpm -r typecheck && pnpm -r lint",
-        "test:all": "pnpm -r test"
+        "test:all": "pnpm -r test",
+        "conformance:client": "npx tsx src/conformance/everything-client.ts",
+        "test:conformance:client": "npx @modelcontextprotocol/conformance client --command 'npx tsx src/conformance/everything-client.ts'",
+        "test:conformance:client:all": "npx @modelcontextprotocol/conformance client --command 'npx tsx src/conformance/everything-client.ts' --suite all"
     },
     "devDependencies": {
+        "@modelcontextprotocol/client": "workspace:^",
         "@cfworker/json-schema": "catalog:runtimeShared",
         "@changesets/changelog-github": "^0.5.2",
         "@changesets/cli": "^2.29.8",