feat(agent): add structured outputs and media archive support

messages/de.json

@@ -218,7 +218,14 @@
     "skeletonBadge": "SKELETON",
     "plannedOutputLabel": "Geplanter Output",
     "channelLabel": "Kanal",
+    "artifactTypeLabel": "Artefakttyp",
     "typeLabel": "Typ",
+    "sectionsLabel": "Abschnitte",
+    "metadataLabel": "Metadaten",
+    "qualityChecksLabel": "Qualitaetschecks",
+    "previewLabel": "Vorschau",
+    "previewFallback": "Keine Vorschau verfuegbar",
+    "emptyValue": "-",
     "bodyLabel": "Inhalt",
     "plannedContent": "Geplanter Inhalt"
   },

messages/en.json

@@ -218,7 +218,14 @@
     "skeletonBadge": "Skeleton",
     "plannedOutputLabel": "Planned output",
     "channelLabel": "Channel",
+    "artifactTypeLabel": "Artifact type",
     "typeLabel": "Type",
+    "sectionsLabel": "Sections",
+    "metadataLabel": "Metadata",
+    "qualityChecksLabel": "Quality checks",
+    "previewLabel": "Preview",
+    "previewFallback": "No preview available",
+    "emptyValue": "-",
     "bodyLabel": "Body",
     "plannedContent": "Planned content"
   },