fix: add schemas re-export file and update tests to use correct manifest version

- Create src/schemas.ts to re-export from schemas/index.ts for test imports
- Update test manifests to use manifest_version "0.2" instead of "1.0" or "1.0.0"
- Fix import sorting and formatting issues in schema files
- Export McpbManifestSchema from schemas/index.ts

src/schemas/index.ts

@@ -1,4 +1,6 @@
 export * as v0_1 from "./0.1.js";
 export * as v0_2 from "./0.2.js";
-
-export { MANIFEST_VERSION as CURRENT_MANIFEST_VERSION } from "./0.2.js";
+export {
+  MANIFEST_VERSION as CURRENT_MANIFEST_VERSION,
+  McpbManifestSchema,
+} from "./0.2.js";