Add a mandatory migration gate to req-dev covering existing-model reuse, real consumer tracing, stable API contracts, dual-write/projection, backfill, deduplication, rollback, and end-to-end user-visible acceptance.
Why
Prevent new write paths or ledgers from becoming disconnected from existing APIs and client-visible read models.
## What
Add a mandatory migration gate to req-dev covering existing-model reuse, real consumer tracing, stable API contracts, dual-write/projection, backfill, deduplication, rollback, and end-to-end user-visible acceptance.
## Why
Prevent new write paths or ledgers from becoming disconnected from existing APIs and client-visible read models.
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What
Add a mandatory migration gate to req-dev covering existing-model reuse, real consumer tracing, stable API contracts, dual-write/projection, backfill, deduplication, rollback, and end-to-end user-visible acceptance.
Why
Prevent new write paths or ledgers from becoming disconnected from existing APIs and client-visible read models.