Implement complete hierarchical summary phase for AdvancedConsoleOutputRecorder

- Add full hierarchical console output with Unicode box-drawing characters
- Implement cross-platform terminal width detection (no stty dependency)
- Use ASCII-based icon set for maximum platform compatibility
- Add right-aligned duration formatting with clean x.xxs format
- Follow single lock per event architecture for thread safety
- Separate string formatting from console output logic for testability
- Remove Foundation dependency - use Swift standard library only
- Remove progress bar functionality to focus on hierarchical summary
- Fix Environment.flag optional unwrapping in EntryPoint.swift

Features:
- Beautiful tree structure with ╰─, ├─, │ Unicode characters
- 3-space indentation per hierarchy level
- Clean duration display (0.05s, 0s, 0.06s)
- Proper test status icons and issue reporting
- Complete final summary with symbol showcase
- Signal handling for on-demand status reporting

Author: tienquocbui

Sources/Testing/ABI/EntryPoints/EntryPoint.swift

@@ -65,7 +65,7 @@ func entryPoint(passing args: __CommandLineArguments_v0?, eventHandler: Event.Ha
         }
 
         configuration.eventHandler = { [oldEventHandler = configuration.eventHandler] event, context in
-          eventRecorder.handle(event, in: context)
+          eventRecorder.record(event, in: context)
           oldEventHandler(event, context)
         }
       } else {