📝 docs: add BDD implementation plan for pending tests

bdd_implementation_plan.md

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+Pending BDD Tests Implementation Plan
+
+Current Status:
+- 54 scenarios total
+- 30 scenarios passing
+- 24 scenarios pending
+- 0 scenarios undefined
+
+Implementation Plan:
+
+1. **JWT Secret Rotation Tests** (High Priority)
+   - Token validation with multiple valid secrets
+   - Secret rotation scenarios
+   - Graceful rotation during retention period
+
+2. **JWT Secret Retention Tests** (High Priority)
+   - Automatic cleanup of expired secrets
+   - Secret retention based on TTL factor
+   - Maximum retention period enforcement
+   - Cleanup frequency configuration
+
+3. **User Authentication Tests** (Medium Priority)
+   - Successful user authentication
+   - Failed authentication scenarios
+   - Admin authentication
+   - User registration
+   - Password reset functionality
+
+4. **Configuration & Monitoring Tests** (Medium Priority)
+   - Configuration validation
+   - Metrics for secret retention
+   - Log masking for security
+   - Monitoring and alerting
+
+Next Steps:
+
+1. Implement JWT secret rotation logic in the authentication service
+2. Add JWT secret retention and cleanup functionality
+3. Implement user authentication and registration endpoints
+4. Add configuration validation and monitoring
+5. Implement step definitions for pending scenarios
+6. Run full test suite to verify all scenarios pass
+
+Estimated Time: 2-3 days