Development record

abcd reserve refuses a footprint whose reservation message passes the 4096-byte cap, and takes only an explicit list of paths, so a large stacked build cannot name its whole diff: renewing the worktree store's reservation after a rebase with its 83 changed paths was refused at 4740 bytes, and the renewal had to fall back by hand to the store's original 50 paths, leaving the rebased-in paths unreserved.