This is a Neovim plugin that enhances in-editor Markdown rendering using tree-sitter parsing, extmarks, and virtual text. It provides rich visual formatting for headings, code blocks, tables, lists, checkboxes, callouts, quotes, links, LaTeX, YAML, HTML, and more. The plugin runs entirely inside Neovim, attaches to buffers via autocommands, and renders only the visible range for performance. It is highly configurable with component-level options, presets, per-buffer overrides, custom handlers, and integration with completion engines (nvim-cmp, blink.cmp, coq_nvim) and LSP. The architecture is modular: core modules manage lifecycle and UI, library modules provide reusable utilities (intervals, iterators, marks, nodes), and render modules dispatch tree-sitter queries to produce extmarks. The codebase is well-structured with comprehensive tests, health checks, and debugging tools. It demonstrates strong Neovim plugin craftsmanship with clear separation of concerns and extensibility patterns.