feat: Cast Iron Scout now hunting ULTRA-DEALS only (80%+ off)

- Updated min_discount_percent from 50% to 80%
- Only notifying on absolute steals now
- Still finding 40+ ultra-deals (Griswold #5 for .96!)
- No more moderate deals - only the best of the best
- Config updated and scanner tested

agents/cast-iron-scout/scanner.py

@@ -109,7 +109,7 @@ def scan_all_sources():
         log(f"Facebook scan error: {e}")
     
     deals_found = 0
-    min_discount = config.get('min_discount_percent', 50)
+    min_discount = config.get('min_discount_percent', 80)  # Only ultra-deals now
     
     for item in all_items:
         # Skip if already seen