fix: add default-terminal tmux-256color to Gentoo .tmux.conf

[stanfish06]

Problem

gentoo/configs-TF-X220/home-stan/.tmux.conf was added (May 6) with only two lines — no default-terminal set. Without it tmux falls back to screen, which has no true-color support and breaks RGB highlighting in neovim and other apps. This is the same class of bug that PRs #16, #22, and #34 fixed for the other tmux configs in this repo.

Fix

Add set -g default-terminal "tmux-256color" and set -sa terminal-features ',xterm-256color:RGB', matching the established pattern. The xterm-256color RGB override is correct because alacritty/alacritty.toml sets TERM = "xterm-256color" in [env], so tmux needs to know that outer terminal supports RGB.

Before

set -s set-clipboard on
bind-key R source-file ~/.tmux.conf \; display-message "tmux.conf reloaded."

After

set -g default-terminal "tmux-256color"
set -sa terminal-features ',xterm-256color:RGB'
set -s set-clipboard on
bind-key R source-file ~/.tmux.conf \; display-message "tmux.conf reloaded."

Test plan

• tmux source ~/.tmux.conf on the TF-X220 — no errors
• tmux info | grep Tc — RGB/Tc reported
• True-color test in neovim works

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