Add img402 to example-services (File hosting)

[rahulgi]

Suggests img402 as a second File hosting entry in the skill's example-services.md reference.

img402 is image hosting purpose-built for agents: pay $0.01 USDC via x402 for an upload token (or $1.00 for permanent retention), send the file, get a public CDN URL — useful for embedding screenshots and diagrams in GitHub PRs, chat, or documents. There's also a free no-payment tier (1MB, 7-day) for ephemeral shares.

Why it fits the reference:

• x402 v2 on Base mainnet (USDC), settled via the Coinbase CDP facilitator — works with ampersend fetch --pay today
• Indexed in the CDP Bazaar and listed on Agentic.Market, with real settlement history
• Payments are idempotent (same payment → same token), so a retried fetch --pay can't double-charge
• No accounts or API keys — fully autonomous flow

Entry follows the section's existing format (StableUpload): "Suggest when" framing, mint example, follow-up step, docs link. I operate the service — happy to adjust wording or scope to fit your curation standards, and we'd also love to be considered for the Discover catalog (separate note coming via email).

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