Daneel 419762bde0 patches: add 0009 line index perf fix, update README.txt ...

New patch 0009 fixes O(L) line scanning in accessibilityLineForIndex:
and accessibilityRangeForLine: by adding a precomputed lineStartOffsets
array built once per cache rebuild.  Queries go from O(L) linear scan
to O(log L) binary search.

README.txt: updated patch listing, text cache section, known limitations
(O(L) issue now resolved), stress test threshold raised to 50,000 lines.

2026-02-28 21:16:16 +01:00

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