feat(sdk): expose split stdout/stderr on execute command response

[MDzaja]

What

Command execution results now expose stdout and stderr separately across
all SDKs (TypeScript, Python sync/async, Go, Ruby, Java), alongside the
existing combined result.

How

• openapi-specs/toolbox.json: ExecuteResponse gains optional
  stdout/stderr string fields.
• All six generated toolbox API clients regenerated.
• Each SDK maps the new fields onto its execute response type:
  • TS: response.stdout / response.stderr (undefined on older daemons)
  • Python: response.stdout / response.stderr (None on older daemons)
  • Go: *string fields (nil on older daemons)
  • Ruby: stdout / stderr readers (nil on older daemons)
  • Java: nullable getStdout() / getStderr()

Backward compatibility

• Fully additive: result, exit_code, and artifacts.stdout keep their
  existing semantics.
• Sandboxes running an older daemon simply don't return the split fields —
  SDKs surface them as null/undefined and result remains the fallback.

---

Summary by cubic

Expose split stdout and stderr on command execution responses across all SDKs to enable separate stream handling. Previously only the interleaved result was available; now stdout and stderr are added without changing existing behavior.

• Contract: ExecuteResponse adds optional stdout and stderr; result remains the combined, interleaved output. Older daemons omit the new fields.
• SDKs: sdk-typescript, sdk-python (sync/async), sdk-go, sdk-ruby, and sdk-java now surface stdout/stderr while preserving result and artifacts.stdout semantics.
• Clients/docs/tests: openapi-specs/toolbox.json and toolbox-api-client-* regenerated; language SDK docs and tests updated to cover both split and legacy behavior.
• Rollout: No migration required. Consumers can start reading stdout/stderr when present and fall back to result on older daemons.

^{Written for commit cb34ec6. Summary will update on new commits.}

[vidoc-agent]

Vidoc security review

Tip

Good to merge — no security issues found. Reviewed 29 changed files.

💬 Have questions? Tag @vidoc in a comment and I'll answer.

[cubic-dev-ai]

All reported issues were addressed across 29 files

<sub>Reply with feedback, questions, or to request a fix.

Re-trigger cubic</sub>