Add Emacs desktop provisioning and dev toolchain packages

Install Emacs and copy the desktop .emacs.d config so the editor setup is managed with the rest of desktop dotfiles. Add vterm/build/debug dependencies plus C/C++ and Go tooling needed by the configured workflow.

dotfiles/desktop/.emacs.d/lisp/tools/treesitter.el

@@ -0,0 +1,29 @@
+;;; treesitter.el -*- lexical-binding: t; -*-
+
+(use-package treesit
+  :ensure nil
+  :config
+  (setq treesit-font-lock-level 4)
+  (setq treesit-auto-install t)
+  (setq major-mode-remap-alist
+	'((c-mode . c-ts-mode)
+          (c++-mode . c++-ts-mode)
+	  (go-mode . go-ts-mode)
+	  (go-mod-mode . go-mod-ts-mode)
+          (python-mode . python-ts-mode)
+          (sh-mode . bash-ts-mode)))
+  (setq treesit-language-source-alist
+	'((bash "https://github.com/tree-sitter/tree-sitter-bash")
+	  (c "https://github.com/tree-sitter/tree-sitter-c")
+          (cpp "https://github.com/tree-sitter/tree-sitter-cpp")
+	  (dockerfile "https://github.com/camdencheek/tree-sitter-dockerfile")
+          (go "https://github.com/tree-sitter/tree-sitter-go")
+	  (gomod "https://github.com/camdencheek/tree-sitter-go-mod")
+	  (js "https://github.com/tree-sitter/tree-sitter-javascript")
+	  (json "https://github.com/tree-sitter/tree-sitter-json")
+	  (node "https://github.com/tree-sitter/node-tree-sitter")
+	  (python "https://github.com/tree-sitter/tree-sitter-python"))))
+
+(provide 'treesitter)
+
+;;; treesitter.el ends here