A cross-layer workflow passes unit tests but breaks when client, API, and persistence state arrive in a different order. The affected area is client telemetry.
Repair the client telemetry runtime configuration implementation so it applies documented precedence and reports unsupported keys.
Evidence
- Affected surface: Full-stack frontend focus / client telemetry.
- Observed failure family: merge layered configuration.
- Scope policy: contractVersion must equal 2.