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.

.chezmoiscripts/run_onchange_after_40-post.sh.tmpl

@@ -0,0 +1,9 @@
+#!/bin/sh
+# Post-apply housekeeping. Re-runs when this file's rendered content changes.
+set -eu
+
+if command -v bat >/dev/null 2>&1; then bat cache --build >/dev/null || true; fi
+
+{{ if eq .chezmoi.os "linux" -}}
+if command -v fc-cache >/dev/null 2>&1; then fc-cache -f >/dev/null || true; fi
+{{ end -}}