feat(F-156): completed feature

work/artifacts/F-156/reviewer.json

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+{
+  "feature_id": "F-156",
+  "agent": "reviewer",
+  "stage": "review_gate",
+  "verdict": "APPROVED",
+  "summary": "El fix elimina la caché de las páginas CMS afectadas y mantiene fallbacks existentes. /about, /contact y /shipping se renderizan bajo demanda y fetchPage no usa caché.",
+  "checks": [
+    {"item":"CMS fetch no-store","ok":true,"evidence":"fetchPage usa fetch(..., { cache: 'no-store' })"},
+    {"item":"Páginas CMS dinámicas","ok":true,"evidence":"about/contact/shipping exportan dynamic='force-dynamic'; build las lista como ƒ"},
+    {"item":"Cambio visible sin rebuild","ok":true,"evidence":"marcador temporal en /about apareció y desapareció tras revertir DB"},
+    {"item":"No rompe fallback","ok":true,"evidence":"catch(() => null) y FALLBACK_HTML se mantienen"},
+    {"item":"Checks verdes","ok":true,"evidence":"frontend build/typecheck/lint/prettier, verify.sh, git diff --check"}
+  ],
+  "issues": []
+}