patches: fold line index + remove NS_AX_TEXT_CAP into 0001-0002

- 0001: remove NS_AX_TEXT_CAP (100K char cap), add lineStartOffsets/
  lineCount ivars and method declarations to nsterm.h
- 0002: add lineForAXIndex:/rangeForLine: O(log L) helpers, build line
  index in ensureTextCache, replace O(L) line scanning in
  accessibilityInsertionPointLineNumber/accessibilityLineForIndex/
  accessibilityRangeForLine, free index in invalidateTextCache/dealloc
- 0009 deleted (folded into 0001+0002)
- README.txt: remove NS_AX_TEXT_CAP references, update known
  limitations, stress test threshold 50K lines

patches/0004-ns-add-interactive-span-elements-for-Tab-navigation.patch

@@ -1,7 +1,7 @@
-From 6626fa801e94c693d0027c3d7b02e750def95df9 Mon Sep 17 00:00:00 2001
+From 1bd12dd5d464d0c3f9774630014e434b8fb0e19e Mon Sep 17 00:00:00 2001
 From: Martin Sukany <martin@sukany.cz>
 Date: Sat, 28 Feb 2026 12:58:11 +0100
-Subject: [PATCH 4/6] ns: add interactive span elements for Tab navigation
+Subject: [PATCH 4/8] ns: add interactive span elements for Tab navigation
 
 * src/nsterm.m (ns_ax_scan_interactive_spans): New function.
 (EmacsAccessibilityInteractiveSpan): Implement AXButton/AXLink
@@ -17,10 +17,10 @@ Tested on macOS 14.  Verified: Tab-cycling through org-mode links,
  1 file changed, 286 insertions(+)
 
 diff --git a/src/nsterm.m b/src/nsterm.m
-index d27e4ed..bfa1b26 100644
+index f1a1b42..91d0241 100644
 --- a/src/nsterm.m
 +++ b/src/nsterm.m
-@@ -8924,6 +8924,292 @@ ns_ax_completion_text_for_span (EmacsAccessibilityBuffer *elem,
+@@ -9169,6 +9169,292 @@ ns_ax_completion_text_for_span (EmacsAccessibilityBuffer *elem,
  
  @end