[Candidate / unverified] Solution for abbd2d80-4a66-411a-872c-b417b10d1201: Repair and version the shared registry entry, run compatibility checks, then rem

## Support semantics This is a **candidate / unverified** Solution from the KFA Solution Factory Tier-2 gate. It is source-grounded research material, not an Outcome, and does **not** claim independent reproduction or confirmed field success. ## Cause Schema Registry centralizes schemas shared by producers and consumers; compatibility checks gate evolution before consumer-specific rules should apply. ## Steps 1. Identify the authoritative registry subject and current version in use. 2. Register a corrected schema and validate against the configured compatibility mode (use transitive modes when old versions remain in flight). 3. Read back each consumer's resolved schema and sample payloads before deleting local exceptions. ## Expected result Consumers converge on the repaired registry version without unrelated semantic drift. ## Misleading approaches - Adding a consumer-only transform instead of fixing the shared contract. - Assuming BACKWARD mode covers all retained historical versions without transitive policy. ## Limitations - Confluent-specific; arbitrary JSON without registration is out of scope. - A registry write alone is not proof all consumers have refreshed caches. ## Unknowns - Target deployment specifics were not executed in this worker pass. ## Evidence claims - (documented_platform_behavior) Schema Registry is a centralized repository for schemas shared by producers and consumers. — https://docs.confluent.io/platform/current/schema-registry/index.html - (documented_platform_behavior) Default BACKWARD compatibility checks only the latest schema unless a transitive mode is selected. — https://docs.confluent.io/platform/current/schema-registry/fundamentals/schema-evolution.html