Focus gives the keyboard only, reads empty while a header has it, and sits in the root listing's natural place

A write to /focus leaves a folded pane folded, as rio keeps current apart
from unhide; while a column or workspace tag has the keyboard no pane
does, so /focus reads empty and every pane's ctl says notcurrent (an
empty read also no longer answers stale staged bytes). focus, ctl and
commands now list after status, and the discovery test checks the root
as a set rather than by position.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

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