Add Emacs config with install scripts for laptop and work

Shared: init.el / early-init.el with Vertico stack, Corfu, Eglot,
treesit-auto, Catppuccin Mocha, doom-modeline, Magit, avy, harpoon,
embark, wgrep, expand-region, envrc, org-mode, and drop-in lang loader.

Lang configs split by stow target:
- shared: elisp, org
- laptop: C/C++, Rust, Go, LaTeX (AUCTeX + latexmk + Zathura)
- work:   C#, JS/TS/HTML/CSS/React (apheleia+prettier), Copilot

install-personal.sh: Fedora — gcc/clang, rustup, Go, texlive, zathura
install-work.sh: Ubuntu 24.04 WSL — dotnet-sdk-10.0, Node 22 via nvm, ts-ls

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

shared/.config/emacs/lisp/langs/elisp.el

@@ -0,0 +1,7 @@
+;;; lisp/langs/elisp.el --- Emacs Lisp  -*- lexical-binding: t -*-
+
+;; Inline macro expansion — C-c e to expand, q to collapse
+(use-package macrostep
+  :bind (:map emacs-lisp-mode-map ("C-c e" . macrostep-expand)))
+
+(add-hook 'emacs-lisp-mode-hook #'flymake-mode)