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d0f116da35
This integrates with macOS accessibility APIs to expose Ghostty terminal structure and content. This is a very, very bare implementation and the terminal contents currently reported are the _full screen and scrollback_ which is way too much for realistic human accessibility use. The target use case for this PR is to enable automated tooling (namely, AI screen readers). However, this is all groundwork we'll need to iterate and improve the accessibility work anyways. To make this work, I also replatformed some of our hacky C APIs onto a more robust `ghostty_surface_read_text` API that can now read arbitrary ranges of the screen into C strings for consumers to use. This will be useful in more places going forward (hint hint). ## Before Accessibility tooling can't read anything, Ghostty has no attributes, no contents, just shows up as a square.  ## After A lot of metadata, including the screen contents as text.  Also, split hierarchies are navigable: https://github.com/user-attachments/assets/a7b2ffb7-dbeb-41b2-8705-9c3200812c4d