Key changes from v9:
- SelectedTextChanged now includes rich userInfo:
direction (Next/Previous/Discontiguous) and
granularity (Character/Word/Line) inferred from
old vs new cursor position comparison
- Track lastAccessibilityCursorPos + lastAccessibilityCursorLine
ivars for position delta detection
- accessibilityInsertionPointLineNumber: buffer lines (count_lines)
instead of visual vpos
- accessibilityLineForIndex: buffer lines via count_lines
- accessibilityRangeForLine: buffer lines via find_newline_no_quit
- Skip notification on unchanged position (avoids VO repeating)
- Word granularity heuristic: same line, >1 char delta
Daneel
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