Gate laptop/work language packs behind stow-loaded modules

Neovim now loads either laptop-languages.lua or work-languages.lua
depending on which stow packages are active. Work mode suppresses
Rust/Go/C/C++/LaTeX servers, DAP, and vimtex entirely via cond guards.

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

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

@@ -0,0 +1,17 @@
+-- Loaded by init.lua when work-languages.lua is absent (laptop stow only).
+-- Mirrors dev-settings.el: C/C++, Go, Rust, DAP.
+return {
+  servers = {
+    clangd        = {},
+    gopls         = {},
+    rust_analyzer = {},
+  },
+  parsers   = { 'c', 'cpp', 'go', 'latex', 'rust' },
+  formatters = {
+    go   = { 'goimports', 'gofmt' },
+    rust = { 'rustfmt' },
+    c    = { 'clang_format' },
+    cpp  = { 'clang_format' },
+  },
+  tools = { 'clang-format' },
+}