audit: comprehensive cleanup — delete 8 files, fix buffer bug, cut bloat

tests/minimal_init.lua

@@ -1,2 +1,3 @@
 -- Minimal init for testing tiny-debugger.nvim
 vim.opt.runtimepath:prepend(vim.fn.getcwd())
+package.path = vim.fn.getcwd() .. "/tests/?.lua;" .. package.path