patches: review fixes — defvar, method extraction, GC safety, window_end_valid
Review-based improvements: - ns-accessibility-enabled DEFVAR_BOOL (disable AX overhead) - window_end_valid guard in ns_ax_window_end_charpos - GC safety comments on Lisp_Object ObjC ivars - postAccessibilityNotificationsForFrame split into 4 methods - block_input in ns_ax_completion_text_for_span - Fplist_get predicate comment - macos.texi VoiceOver section with defvar docs - README updated with USER OPTION + REVIEW CHANGES sections
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