feat: Add scene management tools (save, get_info, unload)

[PhilipLudington]

Summary

• Add get_scene_info tool to retrieve information about loaded scenes
• Add save_scene tool to save the current scene or a specific scene
• Add unload_scene tool to unload a scene (when multiple scenes are loaded)

Changes

• Server~/src/tools/getSceneInfoTool.ts: Get active scene, loaded scene count, and scene details
• Server~/src/tools/saveSceneTool.ts: Save scene with optional path for Save As
• Server~/src/tools/unloadSceneTool.ts: Unload scene with validation (prevents unloading only scene)
• Editor/Tools/GetSceneInfoTool.cs: Unity-side implementation
• Editor/Tools/SaveSceneTool.cs: Unity-side implementation
• Editor/Tools/UnloadSceneTool.cs: Unity-side implementation
• Server~/src/index.ts: Register new tools
• Editor/UnityBridge/McpUnityServer.cs: Register Unity handlers

Test plan

• get_scene_info - returned active scene "Starmap" with 7 root objects
• save_scene - saved scene successfully
• unload_scene - correctly rejects unloading only scene
• unload_scene - successfully unloads when multiple scenes loaded

🤖 Generated with Claude Code

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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[CoderGamester]

Thank you very much for all this extension PRs to improve the tools provided by the MCP @PhilipLudington

LGTM