BRIDGE-5: Shop ← 10.5M Twin Catalog Search (product intelligence)

Enhance Shop /search to query BOTH Vector Search (28K HTS) AND Supabase product_digital_twins (10.5M). Current plan: /shop/search only hits Vector Search index (tariff descriptions). With bridge: ALSO search product_digital_twins for market intelligence. Example response for GET /shop/search?q=cotton+t-shirts: { "tariff_matches": [ {"hts": "6109.10.0012", "rate": "16.5%", "desc": "T-shirts, knitted, cotton"} ], "market_intelligence": { "stores_selling": 47000, "avg_price_usd": 12.50, "top_origins": ["Bangladesh (42%)", "Vietnam (31%)", "China (18%)"], "top_vendors": ["H&M", "Zara", "Shein"], "price_range": {"min": 3.00, "max": 85.00} } } Supabase RPC: ```sql CREATE FUNCTION search_product_catalog(query text, limit_n int) RETURNS TABLE (product_type text, vendor text, avg_price numeric, store_count int, ...) ``` This powers Stream 11 (Catalog Search) AND enriches Stream 23 (Reports). Output: Enhanced Shop search + Supabase catalog RPC Blocked by: Shop service (89c53d32)