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`cj/dirvish-open-file-manager-here' had its platform-dispatch -- xdg-open / open / explorer / shell fallback -- inline as a four-arm cond branching on `executable-find' and `system-type'. Lift the choice into `cj/--file-manager-program-for', a pure function from (HAS-XDG-OPEN-P SYSTEM-TYPE) to a program-name string or nil. The wrapper resolves the live values, asks the helper, and either calls the program or falls back to a shell-command.
Six Normal/Boundary tests cover the four return shapes (xdg-open across system types, darwin/windows-nt without xdg-open, the nil fallback for plain Linux without xdg-open and for unknown system-types like Haiku).
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