Create mise-run-or-just fish function (flakes-0ycg)

Create a fish wrapper function that auto-detects whether to use mise run or just based on whether mise is configured in the current directory. Update the j abbr to use it.

Summary of Changes

• Created : wrapper that checks [ { “path”: “/home/yj/agents/flakes/mise.toml”, “tools”: [] } ] output; if non-empty array, uses , otherwise falls back to
• Updated line 21: →