fix(deploy): include MCP requirements in Cloud Build context

.gcloudignore

@@ -1,6 +1,9 @@
 # Keep Cloud Build uploads aligned with repository exclusions.
 #!include:.gitignore
 
+# Required by opax-mcp/Dockerfile during Cloud Build.
+!opax-mcp/requirements.txt
+
 # Never upload local JSON credentials; retain the intentional test payload.
 *.json
 !a2h2a-test-payload.json

scripts/deploy-mcp.sh

@@ -25,7 +25,7 @@ BUILD_ID="$(
     --async \
     --project="${PROJECT_ID}" \
     --region="${REGION}" \
-    --config="cloudbuild.deploy.yaml" \
+    --config="cloudbuild.build-only.yaml" \
     --format="value(id)" \
     .
 )"