focus history is a stack of locations, and the Jumplist is that same stack

One container, not two: focus_hist (a stack of pane ids rebuilt every sync) is
now jumps[] + a current pointer, and the +Jumps buffer is a RENDERING of that
array — nothing copies it, nothing shadows it. prevFocus, Toggleterm, Look's
directory order, Back/Forward, Last and Jumplist all walk the one list.

A pane id is reused, so a location that only remembered an id would retarget
after a respawn: panes now carry a monotonic serial and an entry whose slot
holds a different serial is dead. trackJump compacts those out and fixes the
pointer in the same pass.

The push rule lives in ONE place and says: a location is worth remembering
when you cannot see it any more — a different pane, or more than a bodyful of
rows away in the same one. So hjkl never grows the list and 100G, a search hit
and a goto-definition do.

Ctrl-o/Ctrl-i walk it, SPC j j toggles the last two, SPC j l lists them.
Ctrl-i IS Tab on a legacy host, where the binding simply never fires and
Tab-executes is untouched; kitty reports them apart. SPC j o/i work anywhere.

Two goldens moved, both the SPC ? Help listing gaining four rows.

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