v0.6.2

Fixed

• from_records now skips zero-coverage duplicate function records when a non-zero record already exists for the same (path, line) key. LLVM coverage can emit multiple function records for the same source — one with actual execution counts and one with all-zero counts. Previously both were aggregated, halving the coverage ratio (e.g., 50% for Protocol::decide despite full branch coverage). The zero-count ghost record is now discarded.