feat: add generated scene skill platform hardening

src/scene_contract/mod.rs

@@ -0,0 +1,7 @@
+pub mod manifest;
+
+pub use manifest::{
+    ArtifactSection, BootstrapSection, DeterministicSection, ManifestSection, PostprocessSection,
+    SceneManifest, SceneParam, SceneSection, SCENE_MANIFEST_FILE_NAME, SUPPORTED_SCENE_CATEGORY_V1,
+    SUPPORTED_SCENE_KIND_V1, SUPPORTED_SCHEMA_VERSION_V1,
+};