style: align comments with the project conventions

Apply a codebase-wide comment audit against the comment conventions:
split banned semicolons and multi-sentence lines into one sentence per
line, cut cross-file and history narration, trim file-top headers to a
single purpose line, and drop verbosity that did not earn its place.
Prose docs (CLAUDE.md, install.md) get the same one-sentence-per-line
and no-semicolon treatment.

modules/desktop/terminal.nix

@@ -4,8 +4,7 @@
   pkgs,
   ...
 }:
-# Alacritty as the desktop terminal, a lightweight GPU renderer that opens
-# fast on the laptop's integrated graphics.
+# Alacritty as the desktop terminal.
 let
   cfg = config.modules.desktop.terminal;
   user = config.user.name;