Micro is a terminal-based text editor written in Go, designed to be intuitive and feature-rich. It provides a full editing experience with multiple cursors, tabs, splits, syntax highlighting, undo/redo, search/replace, autocomplete, and a built-in command bar. The architecture follows a modular design with clear separation of concerns: the `internal/action` package handles keybindings and event dispatching via a trie-based key tree; `internal/buffer` manages text buffers using an efficient line array and an event-driven undo stack; `internal/display` renders the editor UI through a window abstraction that supports soft wrapping and status lines; and `internal/screen` wraps the tcell library for terminal I/O. The editor supports Lua-based plugins that hook into lifecycle events and expose Go standard library packages, enabling extensibility without recompilation. External dependencies include tcell (terminal control), gopher-lua (scripting), go-diff (diff computation), and several forked libraries for JSON5 parsing and shell quoting. The main entry point is `cmd/micro/micro.go`, which parses CLI flags, initializes configuration, loads plugins, and runs the event loop. Data flows primarily involve file I/O (reading/writing buffers), terminal input events (keyboard/mouse), and plugin callbacks. The codebase is well-tested with unit tests, generated buffer tests from VSCode model tests, and CI pipelines across platforms.