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Extract the diagnostic implementation from runtime/lua/vim/diagnostic.lua into focused internal modules covering config, display, float rendering, jump/list helpers, namespace and storage management, severity/shared utilities, and statusline support. Move the builtin handlers into runtime/lua/vim/diagnostic/handlers/ and keep runtime/lua/vim/diagnostic.lua as the public facade that lazily dispatches to the split modules. This preserves the external vim.diagnostic API while making the implementation easier to navigate and reason about. AI-assisted: Codex