* Fix macOS port conflict: Disable SO_REUSEADDR and improve UI port display
- StdioBridgeHost.cs: Disable ReuseAddress on macOS to force AddressAlreadyInUse exception on conflict.
- PortManager.cs: Add connection check safety net for macOS.
- McpConnectionSection.cs: Ensure UI displays the actual live port instead of just the requested one.
* Fix macOS port conflict: Disable SO_REUSEADDR and improve UI port display
- StdioBridgeHost.cs: Disable ReuseAddress on macOS to force AddressAlreadyInUse exception on conflict.
- PortManager.cs: Add connection check safety net for macOS.
- McpConnectionSection.cs: Ensure UI displays the actual live port instead of just the requested one.
* Address CodeRabbit feedback: UX improvements and code quality fixes
- McpConnectionSection.cs: Disable port field when session is running to prevent editing conflicts
- StdioBridgeHost.cs: Refactor listener creation into helper method and update EditorPrefs on port fallback
- unity_instance_middleware.py: Narrow exception handling and preserve SystemExit/KeyboardInterrupt
- debug_request_context.py: Document that debug fields expose internal implementation details
* Fix: Harden Python detection on Windows to handle App Execution Aliases
* Refactor: Pre-resolve conflicts for McpConnectionSection and middleware
* Fix: Remove leftover merge conflict markers in StdioBridgeHost.cs
* fix: clarify create_script tool description regarding base64 encoding
* fix: improve python detection on macOS by checking specific Homebrew paths
* Fix duplicate SetEnabled call and improve macOS Python detection
* Fix port display not reverting to saved preference when session ends
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