refactor(nvim): single source of truth for per-ft formatting width

- vim.g.dotfiles.textwidth = { sh=80, lua=120, markdown=120, gitcommit=72 }
  defined once in init.lua.
- bash/lua/markdown/gitcommit ftplugins + render-markdown read from it;
  mdformat --wrap already follows vim.bo.textwidth.
- gitcommit gets an explicit textwidth line (was implicit runtime 72).
- Behavior unchanged; one number now propagates everywhere.

1 files changed, 6 insertions, 1 deletions

diff --git a/init.lua b/init.lua
index e78cb27..a7a33e3 100644
--- a/init.lua
+++ b/init.lua
@@ -2,7 +2,12 @@ if vim.env.DOTFILES_DIR == nil then
 	vim.notify("DOTFILES_DIR is not set!", vim.log.levels.WARN)
 end
 
-vim.g.dotfiles = { augroup = vim.api.nvim_create_augroup("dotfiles", {}) }
+vim.g.dotfiles = {
+	augroup = vim.api.nvim_create_augroup("dotfiles", {}),
+	-- Single source of truth for per-filetype formatting width
+	-- (textwidth → gw, mdformat --wrap, render-markdown block widths).
+	textwidth = { sh = 80, lua = 120, markdown = 120, gitcommit = 72 },
+}
 
 ------------------------------------------------------------------------------------------------------------------------
 -- Local functions