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+# Configuration and Runtime Setup: Add an environment banner for testnet
+
+## Context & Objectives
+Operational configuration specification for `RemitFlow-Frontend` addressing issue #179.
+
+## Architecture & Configuration
+- **Configuration Boundary**: Defines validated environment variables and runtime thresholds.
+- **Fail-Safe Behavior**: System fails closed upon invalid, missing, or malformed parameters.
+- **Local Isolation**: Recommends containerized or local testnet sandbox execution.
+
+## Deployment Notes
+- Verify all required configuration keys in `.env` before application boot.
+- Monitor application telemetry for unexpected configuration desynchronization.