Joseph Doherty
8de5947e2d
Native-subscribe isolation of an unknown symbol, LastSuccessfulRead advance from pushes alone, a WORD bit write flipping exactly one bit (bit 16 refused), a whole-array REAL write round-trip (length mismatch refused) and a STRING(80) write round-trip (overflow refused). Every writing case restores the seed it touched. Skipped without the TwinCAT XAR fixture. Refs #739 Claude-Session: https://claude.ai/code/session_01Ub9hGmYLQvn9XETzw7CMsT