Operator decision: with .cc canonically MessagePack, the source generator only
duplicated the reflective registry. Nothing reads its output without a
reflection fallback, no consumer builds AOT, and nothing measured a benefit,
while the duplication caused every Cut 4 defect. The registry stays the single
descriptor authority with all rejection rules. Delvehold and EveUnity re-pin
follow-ups are recorded.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>