refactor(plugin-sdk): add shared helper utilities

src/plugin-sdk/agent-media-payload.ts

@@ -0,0 +1,24 @@
+export type AgentMediaPayload = {
+  MediaPath?: string;
+  MediaType?: string;
+  MediaUrl?: string;
+  MediaPaths?: string[];
+  MediaUrls?: string[];
+  MediaTypes?: string[];
+};
+
+export function buildAgentMediaPayload(
+  mediaList: Array<{ path: string; contentType?: string | null }>,
+): AgentMediaPayload {
+  const first = mediaList[0];
+  const mediaPaths = mediaList.map((media) => media.path);
+  const mediaTypes = mediaList.map((media) => media.contentType).filter(Boolean) as string[];
+  return {
+    MediaPath: first?.path,
+    MediaType: first?.contentType ?? undefined,
+    MediaUrl: first?.path,
+    MediaPaths: mediaPaths.length > 0 ? mediaPaths : undefined,
+    MediaUrls: mediaPaths.length > 0 ? mediaPaths : undefined,
+    MediaTypes: mediaTypes.length > 0 ? mediaTypes : undefined,
+  };
+}