patches: restructure per reviewer feedback

Major changes:
1. Zoom separated into standalone patch 0000
   - UAZoomChangeFocus in ns_draw_window_cursor
   - Fallback in ns_update_end for window-switch tracking
   - No overlayZoomActive (source of split/switch/move bug)

2. VoiceOver patches 0001-0008 are now Zoom-free
   - All UAZoom*, overlayZoom*, kUAZoomFocus references removed
   - lastAccessibilityCursorRect kept for VoiceOver bounds queries
   - Commit messages cleaned of Zoom references

3. README.txt and TESTING.txt rewritten for new structure

Addresses reviewer (Stéphane Marks) feedback:
- Keep Zoom patch separate from VoiceOver work
- Design discussion needed for non-Zoom patches
- Performance: ns-accessibility-enabled=nil for zero overhead

patches/0006-doc-add-VoiceOver-accessibility-section-to-macOS-app.patch

@@ -1,4 +1,4 @@
-From 753c2e18a589d38d70df221fa7490d94bdaba937 Mon Sep 17 00:00:00 2001
+From c08f128e25cb645a722c9772e9e4f3a505655d26 Mon Sep 17 00:00:00 2001
 From: Martin Sukany <martin@sukany.cz>
 Date: Sat, 28 Feb 2026 12:58:11 +0100
 Subject: [PATCH 6/8] doc: add VoiceOver accessibility section to macOS
@@ -6,7 +6,6 @@ Subject: [PATCH 6/8] doc: add VoiceOver accessibility section to macOS
 
 * doc/emacs/macos.texi (VoiceOver Accessibility): New node.  Document
 screen reader usage, keyboard navigation, completion announcements,
-Zoom cursor tracking, ns-accessibility-enabled, known limitations.
 ---
  doc/emacs/macos.texi | 75 ++++++++++++++++++++++++++++++++++++++++++++
  1 file changed, 75 insertions(+)