chore: update MEMORY.md + add check_queue.py diagnostic script

- MEMORY.md: rewrote project snapshot to reflect fully live hybrid pipeline
(Supabase, HF Space, Vercel, local worker); added 2026-06-07 session entry
documenting the 3 iPhone Shortcut root causes fixed today:
1. id column needed gen_random_uuid() default for anon REST inserts
2. Shortcut URL/body were swapped (posting TO IG URL, not Supabase endpoint)
3. VITE_API_URL was empty in Vercel production

- backend/check_queue.py: handy diagnostic to inspect and clean up
pending/processing/failed rows in the Supabase queue

- docs/superpowers/plans/2026-06-06-silent-windows-worker.md: commit
previously untracked worker plan doc

check_queue.py

@@ -0,0 +1,25 @@
+import os, sys
+sys.path.insert(0, os.path.dirname(os.path.abspath(__file__)))
+from dotenv import load_dotenv
+load_dotenv(os.path.join(os.path.dirname(os.path.dirname(os.path.abspath(__file__))), '.env'))
+import db
+
+c = db.get_client()
+
+# Delete test row
+c.table('saved_reels').delete().eq('url', 'https://www.instagram.com/reel/DIAGTEST1/').execute()
+print('Test row deleted.')
+
+# Show any non-done rows
+res = c.table('saved_reels').select('id,url,status,source,created_at,error').in_('status', ['pending','processing','failed']).order('created_at', desc=True).limit(10).execute()
+rows = res.data or []
+print(f'Non-done rows in queue: {len(rows)}')
+for r in rows:
+    url = (r['url'] or 'NO URL')[:60]
+    err = (r.get('error') or '')[:60]
+    src = (r.get('source') or '')[:8]
+    print(f"  {r['status']:<12} | {src:<8} | {url} | err={err}")
+
+# Also show total row count
+total = c.table('saved_reels').select('id', count='exact').execute()
+print(f'Total rows: {total.count}')