refactor(cmdatom): merge `curcmd` into root CmdFrame

Problem:
- `curcmd` has the lifetime of the root CmdFrame, but lives in its own
  container with a reset (atom_redo_reset) that must mirror "toplevel
  user command".
- `curcmd.follow` is also the wrong scope: the clock-edge is deferred
  across a mapping's keys, each a toplevel command, so
  `nnoremap <F1> 1q=j2q=` runs "j" in follow-mode, yet the edge reads
  the trailing "2q=" and does not cascade the queued motion.

Solution:
- Eliminate `curcmd`. Use the root `CmdFrame` as the source of truth.
- Record follow-at-first-motion on `composite`, which spans exactly the
  frames the deferred clock-edge closes.

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