Make target completion inserts a duplicated quoted command

[bingoYB]

Bug description

Make targets are suggested with a duplicated make prefix inside quotes. Accepting a suggestion inserts that incorrect command into the prompt.

Steps to reproduce

1. In a directory containing this Makefile:

   gen-all:
   	@echo done

2. Type make in a shell running IRIS.

3. Select the gen-all target from the completion menu.

Actual behavior

The menu displays make "make gen-all", and accepting it inserts make "make gen-all" into the prompt. That passes make gen-all as one quoted argument instead of invoking the gen-all target.

Expected behavior

The suggestion should display and insert make gen-all.

Additional context

In commands/runner/makefile.go, the generator includes prefix in each suggestion's Cmd. The completion lookup also adds the command prefix and quotes suggestions containing spaces, which appears to cause the duplicated, quoted command.

Screenshot

[versenilvis]

can you work on this?
currently I'm busy working on #166