feat: add "researching" status + research fields to automatedVideo schema

Adds:
- "researching" status option (between draft and script_ready)
- researchNotebookId field (hidden, stores NotebookLM notebook UUID)
- researchTaskId field (hidden, stores deep research task UUID)
- trendScore field (0-100 from trend discovery)
- trendSources field (comma-separated signal sources)

Co-authored-by: research <research@miriad.systems>

Author: Miriad

sanity/schemas/documents/automatedVideo.ts

@@ -227,6 +227,7 @@ export default defineType({
       options: {
         list: [
           {title: '1 - Draft', value: 'draft'},
+          {title: '1.5 - Researching', value: 'researching'},
           {title: '2 - Script Ready', value: 'script_ready'},
           {title: '3 - Audio Generation', value: 'audio_gen'},
           {title: '4 - Rendering', value: 'rendering'},
@@ -318,6 +319,32 @@ export default defineType({
       type: 'reference',
       to: [{type: 'sponsorLead'}],
     }),
+    defineField({
+      name: 'researchNotebookId',
+      title: 'NotebookLM Notebook ID',
+      type: 'string',
+      description: 'UUID of the NotebookLM notebook used for research',
+      hidden: true,
+    }),
+    defineField({
+      name: 'researchTaskId',
+      title: 'Research Task ID',
+      type: 'string',
+      description: 'UUID of the NotebookLM deep research task',
+      hidden: true,
+    }),
+    defineField({
+      name: 'trendScore',
+      title: 'Trend Score',
+      type: 'number',
+      description: 'Score from trend discovery (0-100)',
+    }),
+    defineField({
+      name: 'trendSources',
+      title: 'Trend Sources',
+      type: 'string',
+      description: 'Comma-separated list of trend signal sources',
+    }),
     defineField({
       name: 'flaggedReason',
       title: 'Flagged Reason',