add serialization schema

Author: aborgna-q

specification/schema/hugr_schema_live.json

@@ -1307,6 +1307,18 @@
                     "default": null,
                     "description": "The name of the encoder used to generate the Hugr.",
                     "title": "Encoder"
+                },
+                "entrypoint": {
+                    "anyOf": [
+                        {
+                            "type": "integer"
+                        },
+                        {
+                            "type": "null"
+                        }
+                    ],
+                    "default": null,
+                    "title": "Entrypoint"
                 }
             },
             "required": [

specification/schema/hugr_schema_strict_live.json

@@ -1307,6 +1307,18 @@
                     "default": null,
                     "description": "The name of the encoder used to generate the Hugr.",
                     "title": "Encoder"
+                },
+                "entrypoint": {
+                    "anyOf": [
+                        {
+                            "type": "integer"
+                        },
+                        {
+                            "type": "null"
+                        }
+                    ],
+                    "default": null,
+                    "title": "Entrypoint"
                 }
             },
             "required": [

specification/schema/testing_hugr_schema_live.json

@@ -1306,6 +1306,18 @@
                     "default": null,
                     "description": "The name of the encoder used to generate the Hugr.",
                     "title": "Encoder"
+                },
+                "entrypoint": {
+                    "anyOf": [
+                        {
+                            "type": "integer"
+                        },
+                        {
+                            "type": "null"
+                        }
+                    ],
+                    "default": null,
+                    "title": "Entrypoint"
                 }
             },
             "required": [

specification/schema/testing_hugr_schema_strict_live.json

@@ -1306,6 +1306,18 @@
                     "default": null,
                     "description": "The name of the encoder used to generate the Hugr.",
                     "title": "Encoder"
+                },
+                "entrypoint": {
+                    "anyOf": [
+                        {
+                            "type": "integer"
+                        },
+                        {
+                            "type": "null"
+                        }
+                    ],
+                    "default": null,
+                    "title": "Entrypoint"
                 }
             },
             "required": [