diff --git a/.gitea/workflows/build.yaml b/.gitea/workflows/build.yaml
index c027668..9bc5da1 100644
--- a/.gitea/workflows/build.yaml
+++ b/.gitea/workflows/build.yaml
@@ -1,10 +1,14 @@
 name: Build and Push Frontend
 
 on:
+  # NOTA: sin anchors/aliases de YAML (&x / *x) a propósito -- el parser
+  # de workflows de Gitea Actions no los resuelve en el bloque "on:" y
+  # descarta el archivo completo con "unknown on type" (visto en vivo el
+  # 2026-08-15). Las dos listas de paths quedan duplicadas literalmente.
   push:
     branches:
       - main
-    paths: &frontend_paths
+    paths:
       # Código y configuración real del frontend.
       # Los cambios exclusivos de GitOps (frontend.yaml, ingress, patches, etc.)
       # no vuelven a construir la imagen.
@@ -32,7 +36,28 @@ on:
   pull_request:
     branches:
       - main
-    paths: *frontend_paths
+    paths:
+      - 'workloads/ecommerce/Dockerfile'
+      - 'workloads/ecommerce/.dockerignore'
+      - 'workloads/ecommerce/.npmrc'
+      - 'workloads/ecommerce/package.json'
+      - 'workloads/ecommerce/package-lock.json'
+      - 'workloads/ecommerce/next.config.*'
+      - 'workloads/ecommerce/tsconfig.json'
+      - 'workloads/ecommerce/tailwind.config.*'
+      - 'workloads/ecommerce/postcss.config.*'
+      - 'workloads/ecommerce/eslint.config.*'
+      - 'workloads/ecommerce/*.js'
+      - 'workloads/ecommerce/*.mjs'
+      - 'workloads/ecommerce/*.ts'
+      - 'workloads/ecommerce/*.tsx'
+      - 'workloads/ecommerce/app/**'
+      - 'workloads/ecommerce/src/**'
+      - 'workloads/ecommerce/components/**'
+      - 'workloads/ecommerce/lib/**'
+      - 'workloads/ecommerce/public/**'
+      - 'workloads/ecommerce/styles/**'
+      - '.gitea/workflows/build.yaml'
 
 permissions:
   contents: write