Pretty-print public agent card JSON responses

[GsCommand]

Motivation

• Make public agent card JSON returned at .json URLs human-readable in the browser without changing the card schema or DB.
• Preserve existing HTTP semantics (404/error JSON shape) and ensure the response remains application/json; charset=utf-8 for clients.

Description

• Serialize successful card payloads with JSON.stringify(rows[0].card_json, null, 2) so responses are pretty-printed for browser inspection.
• Leave Content-Type as application/json; charset=utf-8 and keep the existing cache header (Cache-Control: public, max-age=300).
• Add safe fallbacks to write the serialized string using res.send, res.end, or res.json (in that order) to support different response implementations used in tests and runtimes.
• Preserve all existing 4xx/5xx JSON error responses and card lookup logic.

Testing

• Ran npm test and fixed an initial failing test caused by the testing harness lacking res.send; after adding fallbacks all tests passed (95 tests, 0 failures).
• Ran cd examples/webhook-auto-verify && npm run check and it completed successfully.
• Confirmed the successful public card response is pretty-printed and that Content-Type remains application/json; charset=utf-8.

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Codex Task

[vercel]

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Project	Deployment	Actions	Updated (UTC)
commandlayer-commandlayer-org	Ready	Preview, Comment	May 23, 2026 11:21pm
commandlayer-org	Ready	Preview, Comment	May 23, 2026 11:21pm
commandlayer-org111	Ready	Preview, Comment	May 23, 2026 11:21pm