Proposes a runtime-gated, default-off BETA capability (post ADR-857) that
adopts Claude Code's Workflow tool — the engine behind /effort ultracode — as
an optional parallel-execution backend for the GSD loop, and folds the existing
ultraplan plan-offload under the same capability. Restores wave parallelism +
plan-checker + verifier on Claude Code that #853 currently forces inline.
Design-only ADR draft accompanying feature request #1143; implementation is
blocked on #857 being released.
Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
