fix(sdk): remove duplicate content property that was overwriting image data

The action object passed to callMainPrompt had two content properties:
1. content: messageContent (conditionally added for images)
2. content: preparedContent (always added)

In JS object literals, later properties overwrite earlier ones, so
images were never sent to the LLM. The fix removes the duplicate
property since preparedContent already handles images correctly
via wrapContentForUserMessage -> buildUserMessageContent.

Author: brandonkachen

sdk/src/run.ts

@@ -299,27 +299,6 @@ type RunExecutionOptions = RunOptions &
     fingerprintId: string
   }
 type RunOnceOptions = Omit<RunExecutionOptions, 'retry' | 'abortController'>
-
-/**
- * Build content array from prompt and optional content
- */
-function buildMessageContent(
-  prompt: string,
-  content?: MessageContent[],
-): Array<{ type: 'text'; text: string } | { type: 'image'; image: string; mediaType: string }> {
-  // If content array is provided, use it (it should already include the text)
-  if (content && content.length > 0) {
-    return content.map((item) => {
-      if (item.type === 'text') {
-        return { type: 'text' as const, text: item.text }
-      }
-      return { type: 'image' as const, image: item.image, mediaType: item.mediaType }
-    })
-  }
-  
-  // Otherwise just return text content from prompt
-  return [{ type: 'text' as const, text: prompt }]
-}
 type RunReturnType = RunState
 
 export async function run(options: RunExecutionOptions): Promise<RunState> {
@@ -842,19 +821,13 @@ export async function runOnce({
     return getCancelledRunState()
   }
 
-  // Build content for multimodal messages
-  const messageContent = buildMessageContent(prompt, content)
-  const hasImages = messageContent.some((c) => c.type === 'image')
-
   callMainPrompt({
     ...agentRuntimeImpl,
     promptId,
     action: {
       type: 'prompt',
       promptId,
       prompt,
-      // Include content array if it has images, otherwise omit
-      ...(hasImages && { content: messageContent }),
       promptParams: params,
       content: preparedContent,
       fingerprintId: fingerprintId,