Add receipt input JSON and SHA256 hash for CVSS policy scoring tests

- Introduced a new JSON fixture `receipt-input.json` containing base, environmental, and threat metrics for CVSS scoring.
- Added corresponding SHA256 hash file `receipt-input.sha256` to ensure integrity of the JSON fixture.

bench/reachability-benchmark/schemas/entrypoints.schema.yaml

@@ -29,6 +29,10 @@ properties:
               type: string
             command:
               type: string
+            args:
+              type: array
+              items:
+                type: string
             schedule:
               type: string
             handler: