U+055F ARMENIAN ABBREVIATION MARK has Word_Break=MidLetter and is
Case_Ignorable in the UCD, but it was missing from the hardcoded list,
so the Greek final sigma context scan stopped at it instead of skipping
it. This affects String.downcase/2 and String.capitalize/2 in :greek
mode on both sides of the Final_Sigma rule.
Assisted-by: Claude Code:claude-opus-5
Signed-off-by: jaideeppyne <jaideeppyne1997@gmail.com>