feat: add execution graph builder plan with reference implementation#269

Draft

johnnygreco wants to merge 3 commits intojena/dev/async-enginefrom

johnny/feat/graph-builder

Commits on Jan 29, 2026

feat: add execution graph builder plan with reference implementation
johnnygreco
committed

Commits on Jan 30, 2026

feat: add checkpoint/restart support to execution graph
johnnygreco
committed
docs: document barrier column checkpoint limitation and options
johnnygreco
committed