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>

shared/.config/emacs/common-dev-settings.el

@@ -0,0 +1,77 @@
+;;; common-dev-settings.el --- Dev tooling shared across all hosts
+
+;;; Completion
+
+(use-package company
+  :defer 1
+  :config
+  (global-company-mode)
+  (setq company-idle-delay 0.2
+        company-minimum-prefix-length 2
+        company-show-numbers t
+        company-tooltip-align-annotations t))
+
+;;; LSP
+
+(use-package eglot
+  :ensure nil
+  :defer t
+  :commands (eglot eglot-ensure)
+  :config
+  (setq eglot-autoshutdown t
+        eglot-send-changes-idle-time 0.5)
+  (setq eldoc-echo-area-use-multiline-p nil)
+  (add-to-list 'eglot-stay-out-of 'eldoc))
+
+;;; Tree-sitter mode management
+;; Grammar sources and installation are host-specific; see dev-settings.el.
+
+(use-package treesit-auto
+  :custom
+  (treesit-auto-install 'prompt)
+  :config
+  (treesit-auto-add-to-auto-mode-alist 'all)
+  (global-treesit-auto-mode))
+
+;;; Utilities
+
+(use-package helpful
+  :defer t
+  :commands (helpful-callable helpful-variable helpful-key))
+
+(use-package smartparens
+  :defer 1
+  :hook (prog-mode . smartparens-mode)
+  :config
+  (require 'smartparens-config))
+
+(use-package yasnippet
+  :defer 2
+  :config
+  (yas-global-mode 1))
+
+(use-package yasnippet-snippets
+  :defer t
+  :after yasnippet)
+
+;;; Emacs Lisp
+
+(add-hook 'emacs-lisp-mode-hook #'eldoc-mode)
+(add-hook 'emacs-lisp-mode-hook #'company-mode)
+
+;;; LSP Keybindings
+
+(with-eval-after-load 'eglot
+  (keymap-set eglot-mode-map "C-c l d" #'xref-find-definitions)
+  (keymap-set eglot-mode-map "C-c l r" #'xref-find-references)
+  (keymap-set eglot-mode-map "C-c l i" #'eglot-find-implementation)
+  (keymap-set eglot-mode-map "C-c l t" #'eglot-find-typeDefinition)
+  (keymap-set eglot-mode-map "C-c l h" #'eldoc-doc-buffer)
+  (keymap-set eglot-mode-map "C-c l s" #'eldoc)
+  (keymap-set eglot-mode-map "C-c l a" #'eglot-code-actions)
+  (keymap-set eglot-mode-map "C-c l n" #'eglot-rename)
+  (keymap-set eglot-mode-map "C-c l e" #'flymake-show-buffer-diagnostics)
+  (keymap-set eglot-mode-map "C-c l f" #'eglot-format-buffer))
+
+(provide 'common-dev-settings)
+;;; common-dev-settings.el ends here