feat: chat uploads, vision turn isolation, and MindSpace agent improvements

Add chat file/image upload UX, attachment proxying, vision thumbnails, and per-turn image scoping so agents only use the current upload. Extend MindSpace asset context, billing token state, OA/scenario verify scripts, and related runtime config.

Co-authored-by: Cursor <cursoragent@cursor.com>

scripts/run-scenario-test.mjs

@@ -19,6 +19,7 @@ import {
   snapshotPublicHtml,
   verifyPageAccess,
   verifySurveyDelivery,
+  verifyChildrenHobbyDietSurvey,
   waitForAssistantGrowth,
   waitForRunTerminal,
   extractAssistantTexts,
@@ -200,6 +201,15 @@ async function runScenario(scenario, port) {
         });
       }
 
+      if (step.expect?.surveyDietUpdate) {
+        await verifyChildrenHobbyDietSurvey({
+          publishKey,
+          baseUrl,
+          reporter,
+          testInsert: step.expect.testInsert !== false,
+        });
+      }
+
       const forbidReply = step.expect?.forbidReplyPatterns ?? [];
       for (const pattern of forbidReply) {
         if (pattern && reply.combined.includes(pattern)) {