main
docs(std/src): clean comments batch 5 — runtime/string core, parse, chars
fix(std): is_char_boundary — repair broken nova:allow (W_PARAM_NO_CONTRACT)
fix(checker): №253 — ok_or(bare-variant)? Try loses context, misresolves
style(std): D452 — migrate to canonical match-arm/statement separators
lint(std/src,examples): fix W_MANUAL_SLICE_TO_END (98) — canonical open-range slices