Split laptop/work into independent stow packages with shared/ base

- Remove work/laptop detection logic from nvim and emacs configs; each
  package now has a self-contained init that requires no runtime checks
- Create shared/ stow package containing nvim/init.lua, emacs/init.el,
  common-dev-settings.el, org-bindings.el, tmux, ghostty, and ranger
- Rename laptop-languages.lua / work-languages.lua → languages.lua in
  each package; shared/init.lua uses require('languages') generically
- Rename work-dev-settings.el → dev-settings.el to match laptop naming
- Expand work/ to include the full set of dev tools (tmux, ghostty,
  ranger, emacs, neovim) without email/calendar tooling
- Add Makefile with `make laptop` and `make work` targets (each runs
  a single `stow shared <profile>` invocation)

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

laptop/.config/nvim/lua/languages.lua

@@ -1,5 +1,7 @@
--- Loaded by init.lua when work-languages.lua is absent (laptop stow only).
--- Mirrors dev-settings.el: C/C++, Go, Rust, DAP.
+-- Laptop language pack: C/C++, Go, Rust, LaTeX, DAP.
+-- Loaded by shared/init.lua via require('languages').
+
+
 return {
   servers = {
     clangd        = {},
@@ -13,5 +15,5 @@ return {
     c    = { 'clang_format' },
     cpp  = { 'clang_format' },
   },
-  tools = { 'clang-format' },
+  tools = { 'clang-format', 'codelldb' },
 }