docs: add medium.com to working sites, remove from blocked list

fix: SSRF IPv6 bypass, SIGINT handler, README accuracy fixes

feat: structured output with description, headings, links

fix: use Memo constructor instead of TransactionBuilder.memo for refund

fix: extract payer from Soroban auth entries, synchronous refund in handler

fix: debug logging for payment response header extraction

fix: move refund hook before x402 middleware, use res.on finish for post-settlement payer extraction

fix: add debug logging for payer extraction, fallback to response header

fix: use base64 not base64url for payment header decoding

fix: extract payer from tx XDR, refund on crash, memo length guard, MCP refund info

fix: install Playwright as node user so browser is accessible at runtime

feat: auto-refund for failed renders (blocked/empty pages) via Stellar USDC transfer

feat: add MCP server for Claude Code / Codex / MCP-compatible agents

docs: add 'Why Agents Need This' section explaining the value proposition

RenderGate: x402-powered headless rendering API on Stellar