Change character class names to Unicode block names and general categories

e.g., "ASCII uppercase letters" should be "Basic Latin/uppercase letters (Lu)" and "Latin-1 lowercase letters" should be "Latin Extended/lowercase letters (Ll)"

No source files, tests, or entry points are identified in the issue. Start by locating where character class names are defined or emitted, then compare the current labels with the Unicode block and general-category terminology in the examples. Done means the relevant labels use the requested names consistently and existing tests or output checks pass.

Written by the indexing model from the issue text.