[diegosouzapw]

Summary

Constrain the shared Auggie spawn helper to its supported three-position stdio tuple, preserving literal inference for discovery/version probes and streaming/non-streaming execution. Runtime arguments, Windows shell behavior and error handling are unchanged. The helper no longer widens a literal tuple to string[], which broke Node spawn overload selection and nullability.

Validation

• Base 2c9938d14e92ca927469a5e9daf81c532097928c, actual tsc --noEmit -p open-sse/tsconfig.json: eight errors (four TS2769, four TS18047).
• Same entire open-sse workspace typecheck after the patch: exit 0, no diagnostics. No baselines or suppressions changed.
• Executor/discovery/header/error handling suites: 30 PASS, two existing Windows-only cases SKIPPED on Linux. This is not live Windows validation.
• Expanded existing helper test covers ignored stdin/piped output in addition to all pipes.
• Prettier, focused ESLint, diff check and full branch pre-commit checks passed.

Draft gate-recovery slice. Integrated exact-candidate CI, build and release/main rollout remain pending.

[diegosouzapw]

Fechando como coberta pela #14511, mergeada na release/v3.8.51 (drenou as mesmas base-reds: genérico de stdio do auggie, imports do projectCombo, strip de _native*Passthrough e os guards de catálogo/prefixo/qwen/opencode/quota). O conteúdo que só esta PR tinha já entrou pelas #14501, #14503, #14508 e #14516. (merge-batch 2026-09-24)