Narrow the terminal tools excluded from Stylix to nvim alone. nvim keeps
its dedicated gbprod/nord.nvim colorscheme, which is richer than the
base16 mapping Stylix would apply.
tmux and fish are now Stylix-managed. Drop the hand-written Nord colours
from the tmux status bar so Stylix themes the status and pane styles,
keeping the minimal layout (session name plus window list) reapplied
after Stylix so it still wins.
Cut restated "what", domain-glossary framing, cross-file consumption
narration, and against-alternative justification from in-file comments;
keep only non-obvious "why" and load-bearing pointers. Drop the
`generateCompletions` line (a no-op restatement of the upstream default)
and its comment.
Configure tmux through home-manager's programs.tmux: the settings it exposes
as options (prefix, keyMode, mouse, baseIndex, clock24, escapeTime,
historyLimit, terminal) are set as options, and every setting it has no option
for is read verbatim from modules/tmux/extra.conf. No tmux plugin manager is
used. The generated config is behaviourally identical to the reference, verified
by parsing it with a live tmux binary.
