feat: Cast Iron Scout agent prototype

- Created autonomous cast iron deal scanner
- Scans eBay RSS feeds hourly for cast iron cookware
- Calculates FMV based on brand, type, size
- Sends Telegram alerts for deals ≥50% below FMV
- Identifies Griswold, Wagner, Wapak, Birmingham, Lodge, Victor
- Tracks seen items to avoid duplicate alerts
- Valuation engine with size multipliers
- Configurable preferences in config.json

Known issue: eBay RSS unreliable - next iteration will use proper scraping

agents/cast-iron-scout/sources/ebay_scanner.py

@@ -0,0 +1,71 @@
+#!/usr/bin/env python3
+"""
+eBay Cast Iron Scanner
+Scans eBay for cast iron cookware deals
+"""
+import requests
+import re
+from datetime import datetime
+from bs4 import BeautifulSoup
+
+def search_ebay_cast_iron():
+    """
+    Search eBay for cast iron items
+    Returns list of items found
+    """
+    # eBay search URL for cast iron cookware
+    # Using their REST API would be better but requires API keys
+    # For now, we'll use RSS feeds which are public
+    
+    search_terms = [
+        "griswold skillet",
+        "wagner cast iron",
+        "vintage cast iron skillet",
+        "cast iron restoration",
+        "wapak skillet",
+        "birmingham skillet"
+    ]
+    
+    items = []
+    
+    for term in search_terms:
+        # eBay RSS feed (no API key needed!)
+        rss_url = f"https://www.ebay.com/sch/i.html?_from=R40&_nkw={term.replace(' ', '%20')}&_sacat=0&LH_TitleDesc=0&_rss=1"
+        
+        try:
+            response = requests.get(rss_url, timeout=10)
+            if response.status_code == 200:
+                soup = BeautifulSoup(response.content, 'lxml-xml')
+                entries = soup.find_all('item')
+                
+                for entry in entries[:10]:  # Top 10 results
+                    try:
+                        title = entry.find('title').text
+                        link = entry.find('link').text
+                        pub_date = entry.find('pubDate').text
+                        
+                        # Extract price from description or title
+                        price_match = re.search(r'\$([\d,]+\.?\d*)', title)
+                        price = float(price_match.group(1).replace(',', '')) if price_match else 0
+                        
+                        items.append({
+                            'title': title,
+                            'price': price,
+                            'link': link,
+                            'source': 'eBay',
+                            'found_at': datetime.now().isoformat(),
+                            'pub_date': pub_date
+                        })
+                    except Exception as e:
+                        continue
+        except Exception as e:
+            print(f"Error scanning eBay for '{term}': {e}")
+    
+    return items
+
+if __name__ == "__main__":
+    print("🔍 Scanning eBay for cast iron deals...")
+    items = search_ebay_cast_iron()
+    print(f"Found {len(items)} items")
+    for item in items[:5]:
+        print(f"  - {item['title'][:60]} - ${item['price']}")