patches: fix 3 blockers — duplicate functions, idx typo, doc cap

BLOCKER fixes:
1. Remove duplicate ns_ax_face_is_selected, ns_ax_selected_overlay_text,
   ns_ax_selected_child_frame_text definitions from patch 0002
   (now defined only in 0007/0008 where they belong)
2. Fix idx → point_idx in accessibilityInsertionPointLineNumber (0002)
3. Remove stale 100K cap reference from documentation (0006)

Architecture fix:
- ns_ax_selected_child_frame_text moved from 0007 to 0008
  (where it logically belongs)

Verified: all 8 patches apply cleanly on fresh emacs HEAD.

patches/0008-ns-announce-child-frame-completion-candidates-for-Vo.patch

@@ -1,4 +1,4 @@
-From d68d1334147a7de273e39cf26c778389faa424ad Mon Sep 17 00:00:00 2001
+From aed0e5447ad6bfb5dc15f7d47b1793e735afd995 Mon Sep 17 00:00:00 2001
 From: Martin Sukany <martin@sukany.cz>
 Date: Sat, 28 Feb 2026 16:01:29 +0100
 Subject: [PATCH 8/8] ns: announce child frame completion candidates for
@@ -43,8 +43,8 @@ childFrameCompletionActive flag.
 refocus parent buffer element when child frame closes.
 ---
  src/nsterm.h |   2 +
- src/nsterm.m | 253 ++++++++++++++++++++++++++++++++++++++++++++++++++-
- 2 files changed, 254 insertions(+), 1 deletion(-)
+ src/nsterm.m | 255 ++++++++++++++++++++++++++++++++++++++++++++++++++-
+ 2 files changed, 256 insertions(+), 1 deletion(-)
 
 diff --git a/src/nsterm.h b/src/nsterm.h
 index a007925..1a8a84d 100644
@@ -67,13 +67,15 @@ index a007925..1a8a84d 100644
  @end
  
 diff --git a/src/nsterm.m b/src/nsterm.m
-index ebd52c6..a7025a9 100644
+index 7025e6e..dba0e49 100644
 --- a/src/nsterm.m
 +++ b/src/nsterm.m
-@@ -7310,6 +7310,110 @@ ns_ax_selected_overlay_text (struct buffer *b,
+@@ -7058,6 +7058,112 @@ visual line index for Zoom (skip whitespace-only lines
+ 
+   return nil;
  }
- 
- 
++
++
 +/* Scan buffer text of a child frame for the selected completion
 +   candidate.  Used for frameworks that render candidates in a
 +   child frame (e.g. Corfu, Company-box) rather than as overlay
@@ -181,7 +183,7 @@ index ebd52c6..a7025a9 100644
  /* Build accessibility text for window W, skipping invisible text.
     Populates *OUT_START with the buffer start charpos.
     Populates *OUT_RUNS with an array of visible runs and *OUT_NRUNS
-@@ -12588,6 +12692,105 @@ ns_ax_collect_windows (Lisp_Object window, EmacsView *view,
+@@ -12336,6 +12442,105 @@ - (id)accessibilityFocusedUIElement
     The existing elements carry cached state (modiff, point) from the
     previous redisplay cycle.  Rebuilding first would create fresh
     elements with current values, making change detection impossible.  */
@@ -287,7 +289,7 @@ index ebd52c6..a7025a9 100644
  - (void)postAccessibilityUpdates
  {
    NSTRACE ("[EmacsView postAccessibilityUpdates]");
-@@ -12598,11 +12801,59 @@ ns_ax_collect_windows (Lisp_Object window, EmacsView *view,
+@@ -12346,11 +12551,59 @@ - (void)postAccessibilityUpdates
  
    /* Re-entrance guard: VoiceOver callbacks during notification posting
       can trigger redisplay, which calls ns_update_end, which calls us