* fix(cli): a long video copy reports progress, resumes in 15 s pieces and stops only when stalled
* perf(core): a video copy's size box follows the stage within a fifth, not a half
* docs(cli): shorten two comments to the line limit
* fix(cli): the copy heartbeat drops a finished copy; size budgets follow the stall and progress code
* chore: size budgets rise by this change's measured bytes