fix: Windows spawn, prefab path, preview API, asset deps, error messages; add execute-context resource, tool descriptions, scene/script/asset tools
Bug fixes (verified against Cocos Creator 3.8.8): - diagnostics: shell:true for .cmd/.bat on Windows (T125/T126) - prefabs: duplicatePrefab target resolves under assets/ (T420) - cocos-project: add preview.open candidate for 3.8.8 (T444) - assets-advanced: detect directory assets in inspectAssetDependencies (T110) - scene: improve component-not-found errors with compilation hint (T429) Documentation improvements: - tool-registry: add enum and injected vars to execute_javascript, path format examples, asset ref limitation note - resources: add cocos://mcp/execute-context resource with variables, patterns, pitfalls New tools (core 37->38, full 101->110): - scene-management: create_scene, query_scene_state (core), copy_paste_node, rename_node, reparent_node - scripts: create_script with component/plain templates - prefabs: create_prefab - assets-advanced: batch_asset_ops, find_unused_assets
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