Implement Carry a plan from its first pending task to its last, leaving evidence in the plan itself so that any later session can pick the work up from the files and Git alone. After integration, task completion goes to canonical PR evidence with a local pending copy, following post-merge.md; the tracked host stays unchanged. Arguments are optional: a path to the plan or to a spec, or to choose the mode, and . 1. Follow the shared stage transition contract. Without , finish this meaningful stage and request its next transition; internal commands and tasks of the current authorized plan need n…