refactor(git): unify around the Repo abstraction

lua/git/commit.lua

@@ -7,8 +7,8 @@ local M = {}
 ---@param opts { amend: boolean? }?
 function M.commit(opts)
     local amend = opts and opts.amend or false
-    local _, worktree = repo.current_repo()
-    if not worktree then
+    local r = repo.find()
+    if not r then
         util.warning("not in a git repository")
         return
     end
@@ -19,7 +19,7 @@ function M.commit(opts)
     end
 
     local proxy_buf, proxy_win
-    editor.run(cmd, { cwd = worktree }, function(file_path, done)
+    editor.run(cmd, { cwd = r.worktree }, function(file_path, done)
         local lines = {}
         local f = io.open(file_path, "r")
         if f then