fix(artifacts): delimit sandbox metadata

[iamjr15]

Why

After the large run-code transport fix, production PDF rendering executed successfully but artifact parsing still failed when sandbox or renderer diagnostics shared stdout with the final JSON metadata.

What changed

• emit a reserved final-artifact marker immediately before metadata JSON
• parse only the payload after the last marker
• retain compatibility with a clean JSON-only response
• document the sandbox artifact stdout protocol

Verification

• pnpm lint
• pnpm typecheck
• pnpm turbo build --force
• pnpm deadcode
• pnpm architecture:check
• pnpm turbo skills:build
• live Daytona diagnostic with an injected renderer log followed by marked PDF metadata
• confirmed the marker remains the final output boundary and the rendered PDF payload is valid

Production deep-research and PDF acceptance will be rerun after deployment.

[vercel]

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1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
cheatcode	Skipped		Aug 5, 2026 10:17am