pass 1: get rid of obsolete modules

lua/u/repeat.lua

@@ -1,7 +1,7 @@
 local M = {}
 
 local IS_REPEATING = false
---- @type function
+--- @type function|nil
 local REPEAT_ACTION = nil
 
 local function is_repeatable_last_mutator() return vim.b.changedtick <= (vim.b.my_changedtick or 0) end
@@ -9,6 +9,7 @@ local function is_repeatable_last_mutator() return vim.b.changedtick <= (vim.b.m
 --- @param f fun()
 function M.run_repeatable(f)
   REPEAT_ACTION = f
+  ---@diagnostic disable-next-line: need-check-nil
   REPEAT_ACTION()
   vim.b.my_changedtick = vim.b.changedtick
 end