fix: Centralize ManagedResources lifecycle handling

examples/read.py

@@ -36,7 +36,7 @@ def read_c2pa_data(media_path: str):
         # All objects using this context will have trust configured.
         with c2pa.Context(settings) as context:
             with c2pa.Reader(media_path, context=context) as reader:
-                print(reader.detailed_json())
+                print(reader.crjson())
     except Exception as e:
         print(f"Error reading C2PA data from {media_path}: {e}")
         sys.exit(1)

examples/sign.py

@@ -110,6 +110,6 @@ def callback_signer_es256(data: bytes) -> bytes:
             # The validation state will depend on loaded trust settings.
             # Without loaded trust settings,
             # the manifest validation_state will be "Invalid".
-            print(reader.json())
+            print(reader.crjson())
 
 print("\nExample completed successfully!")

examples/sign_info.py

@@ -40,7 +40,7 @@
 print("\nReading existing C2PA metadata:")
 with open(fixtures_dir + "C.jpg", "rb") as file:
     with c2pa.Reader("image/jpeg", file) as reader:
-        print(reader.json())
+        print(reader.crjson())
 
 # Create a signer from certificate and key files
 with open(fixtures_dir + "es256_certs.pem", "rb") as cert_file:
@@ -103,7 +103,7 @@
         # The validation state will depend on loaded trust settings.
         # Without loaded trust settings,
         # the manifest validation_state will be "Invalid".
-        print(reader.json())
+        print(reader.crjson())
 
 print("\nExample completed successfully!")