Heimdall's parity ruling. The schema server ended a peer's session on the first
frame it could not decode. It now answers message_invalid (field "message") and
keeps the session; RudpCultNetSchemaServer.MaxConsecutiveRefusedFrames (8)
consecutive undecodable frames end it after the last is answered, and any
decoded frame resets the run. Handler faults still end the session at once.
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>