Root cause of 'Ctrl-b does nothing': home-manager was not switched, so the
binding built into the flake was never deployed (~/.config/fish lacked
heal-autosuggest and \cb; the built config had both). Activation needs the
home rebuild, not a system rebuild.
heal-autosuggest is now two-phase (set 0; repaint; set 1; repaint) to give
the reader a disabled-state repaint, which is what clears the wedged
in_flight_autosuggest_request per reader.rs update_autosuggestion. Matches
the manual cure (which had prompt cycles between off and on); the old
back-to-back toggle and the postexec hook did not. User chose the
session-preserving toggle over exec fish.
Noah Masur
e00560c42c