v0.4.0

TTY

• Add Ghostty.TTY for local terminal applications that need raw keyboard input from the current BEAM terminal
• Add Ghostty.KeyDecoder for decoding terminal input bytes into Ghostty.KeyEvent values
• Add examples/tty_keys.exs as an interactive smoke test for current-terminal input, resize events, and key decoding

Testing

• Add Ghostty.Test ExUnit helpers for concise terminal tests: term/1, write/2, lines/2, snapshots, text assertions, key encoding, and cell assertions
• Add snapshot assertion support via assert_snap/3 with UPDATE_GHOSTTY_SNAPSHOTS=1
• Dogfood Ghostty.Test in terminal and cell tests

Terminal

• Return {:error, :invalid_key_event} for invalid keyboard events instead of crashing the terminal GenServer
• Return {:error, :invalid_mouse_event} for invalid mouse events instead of crashing the terminal GenServer

Docs

• Document Ghostty.TTY and ExUnit helpers in the README
• Add Ghostty.TTY, Ghostty.KeyDecoder, and Ghostty.Test to HexDocs groups and package files