feat: add asset preferences, video research, and Remotion ad assets

- Add thumbs-down feedback modal and preference API endpoint
- Add AI UGC video platforms research doc
- Add ReflectAd Remotion composition with public flow assets
- Add gemini-ad-designer and poster-ad-designer pipeline skills
- Add research_reflect_v1.1 pipeline script

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

lib/scanner.ts

@@ -12,6 +12,29 @@ interface ScannedFile {
   metadata: string | null;
 }
 
+/** Truncate a JSON string to maxLen while keeping it valid JSON. */
+function safeJsonTruncate(json: string, maxLen: number): string {
+  if (json.length <= maxLen) return json;
+  try {
+    const parsed = JSON.parse(json);
+    // Try to produce a shorter version by re-stringifying with key limits
+    const trimmed = JSON.stringify(parsed, (_key, value) => {
+      if (typeof value === "string" && value.length > 200) {
+        return value.slice(0, 200) + "…";
+      }
+      if (Array.isArray(value) && value.length > 5) {
+        return value.slice(0, 5);
+      }
+      return value;
+    });
+    if (trimmed.length <= maxLen) return trimmed;
+    // Still too long — return a minimal summary
+    return JSON.stringify({ _truncated: true, _originalLength: json.length });
+  } catch {
+    return JSON.stringify({ _truncated: true, _originalLength: json.length });
+  }
+}
+
 const FORMAT_TO_TYPE: Record<string, string> = {
   png: "image",
   jpg: "image",
@@ -65,13 +88,13 @@ function loadMetadata(fullPath: string, format: string): string | null {
       if (Array.isArray(parsed)) {
         return JSON.stringify({ captions: parsed.slice(0, 3), totalVariations: parsed.length });
       }
-      return content.slice(0, 2000);
+      return safeJsonTruncate(content, 2000);
     }
 
     // For media files, look for adjacent JSON with same name
     const jsonPath = fullPath.replace(/\.[^.]+$/, ".json");
     if (existsSync(jsonPath)) {
-      return readFileSync(jsonPath, "utf-8").slice(0, 2000);
+      return safeJsonTruncate(readFileSync(jsonPath, "utf-8"), 2000);
     }
 
     // Look for manifest in same directory
@@ -85,7 +108,10 @@ function loadMetadata(fullPath: string, format: string): string | null {
         const entry = manifest.find((e: { fileName?: string; file?: string }) =>
           e.fileName === fileName || e.file === fileName
         );
-        if (entry) return JSON.stringify(entry);
+        if (entry) {
+          // Ensure style field is preserved in metadata
+          return JSON.stringify(entry);
+        }
       }
     }
 
@@ -122,6 +148,25 @@ function scanDirectory(dir: string, baseDir: string): ScannedFile[] {
         const ext = path.extname(entry).toLowerCase().slice(1);
         if (!ext || ext === "gitkeep") continue;
 
+        // Only ingest deliverable files — skip source/build artifacts
+        const ASSET_EXTENSIONS = new Set([
+          "png", "jpg", "jpeg", "webp", "gif",  // images
+          "mp4", "webm",                          // videos
+        ]);
+        const CONTENT_EXTENSIONS = new Set([
+          "json", "md", "txt",                    // copy/scripts/research
+        ]);
+        // Skip HTML source files, render scripts, and build tools
+        if (!ASSET_EXTENSIONS.has(ext) && !CONTENT_EXTENSIONS.has(ext)) continue;
+        // Skip known build/tool artifacts
+        const SKIP_FILES = new Set([
+          "tavily_search.mjs", "render_posters.mjs", "design_philosophy.md",
+        ]);
+        if (SKIP_FILES.has(entry)) continue;
+        // Skip HTML source files in ads/ (they're build artifacts, not deliverables)
+        const relativePath0 = path.relative(baseDir, fullPath);
+        if (ext === "html" && relativePath0.includes("/ads/")) continue;
+
         const relativePath = path.relative(baseDir, fullPath);
         const type = inferTypeFromPath(relativePath, ext);
         const metadata = loadMetadata(fullPath, ext);