Development record

The implement step sentence at internal/core/surface/sentences.go:221-222, rendered as the verb's one-line help and at docs/reference/cli/commands.md:2788, says the step 'refuses a push with no preflight receipt'. Since 13b7bd1aa (ruling DR6d-2) a landing whose head no preflight receipt names waits instead: a contention that holds only that lane, the call moving the others and exiting 3 only when nothing else moves (internal/core/implement/loop/land.go:439-452). The step's own Long help says so (internal/surface/cli/build.go:834-837), so the sentence and the paragraph under it disagree; an agent reading only the sentence treats a waiting lane as refused.