Detect fzf version once at shell startup inside fzf_key_bindings.
Use bg-transform (non-blocking) on fzf >= 0.62 and the synchronous
transform on older builds (e.g. 0.60 devel which lacks bg-transform).
The chosen action is captured into fzf-history-widget via fish's
--inherit-variable so the check runs once, not on every Ctrl+R press.
- conf.d/fzf.fish: skip fzf_configure_bindings if fzf is not in PATH
- key_bindings.fish: only bind Ctrl+Alt+= when qalc is installed
- _qalc_eval: return 1 early if qalc is absent so callers can react
- _smart_execute: fall back to normal execute when _qalc_eval returns 1
- integrations/fzf.fish: replace bg-transform with transform (available
since fzf 0.53; bg-transform requires a newer version and caused
"unknown action" errors on fzf 0.60 devel)
rootiest
