Add AutoHotkey 2.0 extension

[BlessEphraem]

Summary

Adds syntax highlighting support for AutoHotkey v2 (AHK2).

Extension repo: https://github.com/BlessEphraem/zed-ahk2

Why a separate extension from autohotkey?

The existing autohotkey extension targets AHK v1. AHK v2 is a breaking redesign — different syntax, different keywords, different string delimiters (v2 uses " only), different class system, etc. A shared grammar cannot correctly highlight both.

Features

• Tree-sitter grammar written from scratch for AHK2
• Hotkeys and hotstrings, including non-ASCII / AZERTY keys (#é::, #²::, !&::, …)
• Classes, methods, properties, arrow functions
• Directives (#Requires, #Include, #HotIf, …)
• Built-in variables (A_ThisHotkey, A_ScriptDir, …)
• Case-insensitive keyword handling via GLR parsing
• File extensions: .ah2, .ahk2 (avoids conflict with v1 extension on .ahk)
• first_line_pattern detects #Requires AutoHotkey 2 for auto-identification

Checklist

• extension.toml present and valid
• Grammar compiles (tree-sitter grammar + src/parser.c committed)
• No .ahk suffix conflict with existing autohotkey extension
• MIT license

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[BlessEphraem]

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