feat: Cast Iron Scout multi-channel expansion

- Added Craigslist scanner framework
- Added Facebook Marketplace placeholder
- Updated main scanner to aggregate all sources
- Added STATUS.md for development tracking
- Fixed import paths for all scanners
- Ready for HTML scraping implementation

Current status:
- eBay: RSS built but unreliable, need HTML scraping
- Craigslist: Framework ready, debugging HTML parsing
- Facebook: Placeholder (needs Selenium)
- All sources tracked in unified scan loop

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

@@ -0,0 +1,40 @@
+#!/usr/bin/env python3
+"""
+Facebook Marketplace Scanner
+Scans FB Marketplace for local cast iron deals
+Note: Requires Selenium for now (FB has no public API)
+"""
+import re
+from datetime import datetime
+
+# Facebook Marketplace doesn't have RSS or public API
+# This is a placeholder for when we implement Selenium/Playwright
+# For now, we'll use manual URL monitoring
+
+def search_facebook_marketplaceCast_iron(config, location_radius=50):
+    """
+    Search Facebook Marketplace for cast iron
+    This will eventually use Selenium to scrape FB Marketplace
+    
+    For now, returns empty list - will be implemented with:
+    - Selenium WebDriver (headless Chrome)
+    - Location-based searches
+    - Image extraction
+    """
+    items = []
+    
+    # TODO: Implement Selenium scraper
+    # Search URLs to monitor:
+    # https://www.facebook.com/marketplace/search?query=cast%20iron%20skillet
+    # https://www.facebook.com/marketplace/search?query=griswold
+    # https://www.facebook.com/marketplace/search?query=wagner%20cast%20iron
+    
+    print("📘 Facebook Marketplace scanner: Pending Selenium implementation")
+    print("   Manual check: https://www.facebook.com/marketplace/search?query=cast%20iron")
+    
+    return items
+
+if __name__ == "__main__":
+    print("Testing Facebook Marketplace scanner...")
+    items = search_facebook_marketplaceCast_iron({})
+    print(f"Found {len(items)} items")