Add Colombia TRM

[unicentrocucuta]

Add Colombia TRM origin to Agent402 DEFAULT_SEEDS.

• Origin: https://x402.lagaceta.net
• Manifest: https://x402.lagaceta.net/.well-known/x402 (9 resources)
• Unique live product: GET /trm $0.005 official Colombian USD/COP (Superintendencia Financiera / datos.gov.co mcec-87by)
• Unpaid GET /trm returns HTTP 402
• CDP public validate accepted; not yet in CDP search index
• Stable HTTPS origin, no tunnel

One-line insert only. Index can crawl and health-check.

[MikeyPetrillo]

Verified live: manifest matches exactly (9 resources), GET /trm genuinely 402s with a correct, well-formed x402 challenge at $0.005 on Base. Merging.