OptionalrepairedSet only when strict parsing failed and a repair pass recovered the
call — never silent (02d723a:docs/design/web-chat-redesign.md Appendix A,
beat-matrix Axis 7, self-healing row). repairs lists
every malformation class that had to be corrected, in application
order, so failures are observable (logs/telemetry) instead of masked.
Optionalrepairs
Parsed argument object (callers serialize for OpenAI's string field).