Merge branch 'main' into test/milestone-repository-queries

Author: believetimothy

.kiro/specs/horizon-listener-sync/tasks.md

@@ -257,7 +257,7 @@ This implementation plan breaks down the Horizon Listener → Database Sync feat
     - Process events
     - Assert audit log includes event_type, transaction_hash, ledger_number, processing_duration_ms
 
-- [ ] 6. Checkpoint - Ensure event processor tests pass
+- [x] 6. Checkpoint - Ensure event processor tests pass
   - Ensure all tests pass, ask the user if questions arise.
 
 - [x] 7. Implement Horizon listener service
@@ -410,7 +410,7 @@ This implementation plan breaks down the Horizon Listener → Database Sync feat
     - Add RETRY_BACKOFF_MS with default value
     - _Requirements: 14.1_
 
-- [ ] 14. Final checkpoint - Ensure all tests pass
+- [x] 14. Final checkpoint - Ensure all tests pass
   - Ensure all tests pass, ask the user if questions arise.
 
 - [x] 15. Stellar SDK Upgrade Regression Suite

README.md

@@ -80,6 +80,10 @@ Admin-only access requirements for audit query endpoints:
 
 All timestamps are stored, transmitted, and returned in UTC (ISO 8601 with `Z` suffix). Input timestamps must include a timezone designator. See [Timezone Contract](docs/TIMEZONE_CONTRACT.md) for the full specification.
 
+## Configuration
+
+For a complete reference of all supported environment variables, their types, defaults, and security considerations, see [Configuration Reference](docs/configuration.md).
+
 ## Tech stack
 
 ## Background job system