feat(schema): expose kind as a property on write schema nodes [INFP-234]

Reading a locally-authored (write) schema needs `.kind` attribute access
(e.g. the protocols CLI command). Expose `kind` as a plain property on the
write node models — derived from namespace+name, like on read — but do not
serialize it: on write it stays a property (not a `@computed_field`) so it
never enters the payload, where `extra="forbid"` would reject it on the
round-trip through the write/load contract. `hash` remains read-only.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: dgarros

infrahub_sdk/schema/generated/write.py

@@ -506,6 +506,10 @@ class BaseNodeSchemaWrite(BaseModel):
         description="Node Relationships",
     )
 
+    @property
+    def kind(self) -> str:
+        return f"{self.namespace}{self.name}"
+
 
 class NodeSchemaWrite(BaseNodeSchemaWrite):
     model_config = ConfigDict(extra="forbid", use_enum_values=True)