- Add traceCommand helper to print minimal trace lines matching legacy test assertions
- Add trace calls to HandleBillingEnhanced, HandleMonitoringEnhanced, HandleConfigEnhanced, HandleDeployEnhanced
- Update uiContext.header to prefix output with "Telecom Platform CLI" brand line
- Add godoc explaining trace format mirrors old placeholder output for test compatibility
- Update HandleBilling to accept CLIConfig, return error, and use uiContext for all output
- Update HandleConfig to accept CLIConfig, return error, and use uiContext for all output
- Replace manual colorizer/icon initialization with uiContext helper methods
- Simplify error handling with uiContext.errorln, warn, success, info, muted methods
- Replace direct table creation with uiContext.newTable()