Simplify CI to build and test only

.github/workflows/ci.yml

@@ -20,14 +20,6 @@ jobs:
           ref: main
           path: intentproof-spec
 
-      - name: Ensure spec sdk-signing golden checkout
-        run: |
-          if [[ -d intentproof-spec/golden/sdk-signing ]]; then
-            exit 0
-          fi
-          git -C intentproof-spec fetch origin phase3-ecosystem-conformance
-          git -C intentproof-spec checkout FETCH_HEAD
-
       - uses: actions/setup-node@v4
         with:
           node-version: '22'
@@ -36,12 +28,7 @@ jobs:
       - name: Install dependencies
         run: npm ci
 
-      - name: Run tests with coverage
-        env:
-          INTENTPROOF_SPEC_DIR: intentproof-spec
-        run: npm run test:coverage
-
-      - name: Verify sdk-signing fixtures synced with spec
+      - name: Run tests
         env:
           INTENTPROOF_SPEC_DIR: intentproof-spec
-        run: bash ./scripts/check-sdk-signing-fixtures-sync.sh
+        run: npm test