fix(ci): add build step to k8s and aws integration jobs

The orchestrator tests need compiled output (dist/index.js) to exist
before running integration tests that spawn containers/k8s jobs.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.github/workflows/validate-orchestrator-integration.yml

@@ -385,6 +385,12 @@ jobs:
 
       - run: yarn install --frozen-lockfile
 
+      - name: Build orchestrator
+        run: |
+          echo "Building orchestrator TypeScript..."
+          yarn build
+          echo "✓ orchestrator build successful"
+
       # --- Fast unit tests (fast-fail gate before heavy infra tests) ---
       - name: Run orchestrator unit tests (fast, no infra)
         timeout-minutes: 2
@@ -679,6 +685,12 @@ jobs:
 
       - run: yarn install --frozen-lockfile
 
+      - name: Build orchestrator
+        run: |
+          echo "Building orchestrator TypeScript..."
+          yarn build
+          echo "✓ orchestrator build successful"
+
       # --- AWS Test 1: orchestrator-image ---
       - name: Run orchestrator-image test (AWS)
         timeout-minutes: 10