Double-click any path in a tmux pane (a git status line, an rg hit, a
stack-trace frame, a ToolName(path) tool-call line, …) and it opens in the
Neovim instance running in another pane of the same window, jumping to the
right line/col when the token carries a :line[:col] suffix.
It works by giving each nvim a per-pane RPC socket, then having a tmux
double-click binding hand the clicked word to a small script that cleans it up
and sends :edit to that socket.