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/0007-ns-announce-overlay-completion-candidates-for-VoiceO.patch

@@ -1,4 +1,4 @@
-From 6bb9020421ce0e8459d2095385972b47c64fd184 Mon Sep 17 00:00:00 2001
+From 2222c14590612835529f88c0062fefeedc8f7187 Mon Sep 17 00:00:00 2001
 From: Martin Sukany <martin@sukany.cz>
 Date: Sat, 28 Feb 2026 14:46:25 +0100
 Subject: [PATCH 7/8] ns: announce overlay completion candidates for VoiceOver
@@ -32,24 +32,17 @@ Key implementation details:
   Do not post SelectedTextChanged (that reads the AX text at cursor
   position, which is the minibuffer input, not the candidate).
 
-- Zoom tracking: store the selected candidate's rect (at the text
-  area left edge, computed from FRAME_LINE_HEIGHT) in overlayZoomRect.
-  ns_draw_window_cursor checks overlayZoomActive and uses the stored
-  rect instead of the text cursor rect, keeping Zoom focused on the
   candidate line start.  The flag is cleared when the user types
   (BUF_CHARS_MODIFF changes) or when no candidate is found
   (minibuffer exit, C-g).
 
-* src/nsterm.h (EmacsView): Add overlayZoomActive, overlayZoomRect.
 (EmacsAccessibilityBuffer): Add cachedCharsModiff.
 * src/nsterm.m (ns_ax_face_is_selected): New predicate.  Match
 "current", "selected", and "selection" in face symbol names.
 (ns_ax_selected_overlay_text): New function.
-(ns_draw_window_cursor): Use overlayZoomRect when active.
 (EmacsAccessibilityBuffer ensureTextCache): Remove overlay_modiff.
 (EmacsAccessibilityBuffer postAccessibilityNotificationsForFrame:):
 Independent overlay branch, BUF_CHARS_MODIFF gating, candidate
-announcement with overlay Zoom rect storage.
 ---
  src/nsterm.h |   3 +
  src/nsterm.m | 359 ++++++++++++++++++++++++++++++++++++++++++++++-----