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firstLineOf (query) and truncateString (edit) sliced strings at a raw byte offset, splitting a multibyte UTF-8 character into invalid bytes in LLM-facing output (ast_query compact format and edit not-found errors are hot paths). Extract the rune-boundary backoff already used by search's truncateLine into util.RuneBoundary and route all three sites through it. Adds table-driven tests for the primitive and a multibyte case for firstLineOf.