fix(builtins): use char-based precision truncation in printf#467
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printf %.*s was using byte slicing which panics when the truncation point falls inside a multi-byte UTF-8 character. Now uses chars().take(prec) for safe char-based truncation. Closes #435 https://claude.ai/code/session_01WZjYqxm5xMPAEe7FSHJkDy
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Summary
%.5s) used byte slicing which panicked on multi-byte UTF-8chars().take(prec).collect()for safe char-based truncationTest plan
test_precision_multibyte_utf8test_precision_cjkCloses #435