builtins: add upr lwr cap string-case ops#190
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Case normalization is table stakes for any text-handling language. upr uppercases, lwr lowercases, cap title-cases the first character. All three operate on the underlying UTF-8 string and preserve scalars outside the ASCII case-pair range. Opcodes allocated: upr, lwr, cap. Single-arg, single-return, no allocation surprises.
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Case normalization is table stakes for text handling. upr lwr cap close that gap.
Implementation:
Tests: cross-engine regression tests + examples/string-case.ilo with -- run: directives.