feat(contracts): add file output type

Declare the shared "file" contract output type so injectors can emit file
findings (e.g. NetExec spider_plus) and the platform can deserialize them.
Part of the attack-path file finding work (OpenAEV #6647).

Author: Seb-MIGUEL

pyoaev/contracts/contract_config.py

@@ -50,6 +50,7 @@ class ContractOutputType(str, Enum):
     Credentials: str = "credentials"
     Username: str = "username"
     Share: str = "share"
+    File: str = "file"
     AdminUsername: str = "admin_username"
     Group: str = "group"
     Computer: str = "computer"

test/contracts/test_contract_output_types.py

@@ -0,0 +1,15 @@
+import unittest
+
+from pyoaev.contracts.contract_config import ContractOutputType
+
+
+class ContractOutputTypeTest(unittest.TestCase):
+    def test_file_wire_label(self):
+        # The wire label is a public contract shared with the platform enum and every
+        # injector that declares a `file` output; it must stay exactly "file".
+        self.assertEqual(ContractOutputType.File.value, "file")
+        self.assertEqual(ContractOutputType.File, "file")
+
+
+if __name__ == "__main__":
+    unittest.main()