fix(sandbox): support large run-code payloads

[iamjr15]

Why

Rich Markdown PDF generation builds a renderer script larger than the public exec argv-element limit. ProjectSandbox.runCode reused that exec path, so the validated 8,790-character renderer failed before execution with an 8,192-character Zod limit.

What changed

• keep public exec argv limits unchanged
• transport validated run-code source as bounded base64 request-environment chunks
• pipe source to Node or Python over stdin, preserving top-level module behavior
• execute inside the existing runCode lease without writing source onto the persistent workspace volume
• document the separate runCode and exec transport contracts

Verification

• pnpm lint
• pnpm typecheck
• pnpm turbo build --force
• pnpm deadcode
• pnpm architecture:check
• pnpm turbo skills:build
• confirmed the production renderer script is 8,790 characters and the prior production error identifies command element 3 exceeding 8,192 characters

Production 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 9:49am