9harness: drop the zmxify script; the mount is the replacement

The script listed /active, ran fzf over it and wrote the chosen name
into an agent's zmx. Everything in it but the picker, a free-name loop
and the attach was `ls` and `cat` against the tree — 130 lines
re-deriving what four lines of shell already read:

  ls /mnt/9p/harness/active/*/*
  cat /mnt/9p/harness/active/claude/345104/session
  echo mine > /mnt/9p/harness/active/claude/345104/zmx
  zmx attach mine

zmxify was 307 lines of rc because there was no filesystem to ask. The
answer to that is the filesystem, not a smaller script on top of it,
which would only become a second and worse interface beside the real
one. DESIGN.md keeps what a caller now arranges itself (a free name,
the attach) and why the old script's own-ancestry rule is gone rather
than moved.

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