The step glossary says the build loop takes a spec's steps one lane at a time; the build chapter runs lanes in parallel up to a ceiling.

The step glossary says the build loop takes a spec's steps one lane at a time; the build chapter runs lanes in parallel up to a ceiling.

A premise contradiction (severity minor) found by the cross-document consistency pass.

• End A: .abcd/development/brief/glossary/core/step.md:18 — "the build loop (abcd build) takes them one lane at a time, the spec's next pending step opening the next lane when a lane is done"
• End B: .abcd/development/brief/04-surfaces/34-build.md:406 — "A run works in parallel up to its ceiling (ruling DR6, spc-2609202134341288)."

step.md says abcd build takes a spec's steps one lane at a time, the next pending step opening the next lane only when a lane is done. 34-build.md says a run works in parallel up to its ceiling (ruling DR6), so several of a spec's steps can be in lanes at once. A reader building from the glossary would serialise what the loop runs in parallel.

Evidence: .abcd/work/reviews/2026-10-26-consistency/00-summary.md, finding 693.