Initial import: chezmoi source for CachyOS + Umbriel + Noctalia

Imported from prdlk/dotfiles master (efdd827). Drops the niri, Hyprland/Omarchy,
macOS, and Blume docs-site layers; docs/ is plain Markdown.

run_onchange_after_build-bat-cache.sh.tmpl

@@ -0,0 +1,7 @@
+#!/bin/sh
+# Rebuild bat's syntax/theme cache when managed inputs change.
+# themes hash: {{ include "dot_config/bat/themes/cyberdream.tmTheme" | sha256sum }}
+# config hash: {{ include "dot_config/bat/config" | sha256sum }}
+set -eu
+command -v bat >/dev/null 2>&1 || exit 0
+bat cache --build >/dev/null