feat: add conformance test infrastructure for v1.x (#1518)

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
Co-authored-by: Paul Carleton <paulcarletonjr@gmail.com>

.github/workflows/conformance.yml

@@ -0,0 +1,40 @@
+name: Conformance Tests
+
+on:
+    push:
+        branches: [v1.x]
+    pull_request:
+        branches: [v1.x]
+    workflow_dispatch:
+
+concurrency:
+    group: conformance-${{ github.ref }}
+    cancel-in-progress: true
+
+permissions:
+    contents: read
+
+jobs:
+    client-conformance:
+        runs-on: ubuntu-latest
+        steps:
+            - uses: actions/checkout@v4
+            - uses: actions/setup-node@v4
+              with:
+                  node-version: 20
+                  cache: npm
+            - run: npm ci
+            - run: npm run build
+            - run: npm run test:conformance:client:all
+
+    server-conformance:
+        runs-on: ubuntu-latest
+        steps:
+            - uses: actions/checkout@v4
+            - uses: actions/setup-node@v4
+              with:
+                  node-version: 20
+                  cache: npm
+            - run: npm ci
+            - run: npm run build
+            - run: npm run test:conformance:server