noctalia-plugin: bar widget, toolbar panel and tile, with Luau tests and a flake check

noctalia-plugin/README.md

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+# valw for Noctalia
+
+A bar button, the valw toolbar as a Noctalia panel, and a control-center
+tile. Noctalia draws everything, so it follows your Noctalia theme.
+
+- Bar button: left click opens the toolbar, right click takes a region shot.
+- Toolbar: click a mode to capture; the timer and options are remembered
+  (shared with `valw toolbar`).
+- Tile: click for a region shot, right click for the toolbar.
+
+Install it with the home-manager module (`programs.valw.noctalia.enable`),
+then enable `elars/valw` in Noctalia and place the widget (type
+`elars/valw:bar`). Toggle the toolbar from a keybind with
+`noctalia msg panel-toggle elars/valw:toolbar`.
+
+Tests: `nix shell nixpkgs#luau -c sh noctalia-plugin/tests/run.sh`.