refactor(git): split engine into core subpackage

plugins/nvim-tree.lua

@@ -5,7 +5,7 @@ end)
 ---@class nvim_tree.api.decorator.UserDecorator
 local Decorator = require("nvim-tree.api").Decorator
 
-local repo = require("git.repo")
+local repo = require("git.core.repo")
 
 repo.on("refresh", function()
     require("nvim-tree.api").tree.reload()
@@ -49,7 +49,7 @@ function GitDecorator:new()
     self.highlight_range = "name"
 end
 
-local status = require("git.status")
+local status = require("git.core.status")
 
 ---@param node Node
 ---@return ow.Git.Status.Mark[]?
@@ -150,7 +150,7 @@ require("nvim-tree").setup({
         full_name = true,
         root_folder_label = function(path)
             local label = vim.fn.fnamemodify(path, ":~")
-            local r = require("git.repo").resolve(path)
+            local r = require("git.core.repo").resolve(path)
             local git_head = r and r:head()
             if git_head then
                 label = label .. ("  %s"):format(git_head)