fix(datamodels): fix names of v31 Schema object fields

Author: char0n

packages/jentic-openapi-datamodels/README.md

@@ -276,9 +276,9 @@ Special cases for Python reserved keywords and `$` fields:
 - `then` → `then_`
 - `else` → `else_`
 - `not` → `not_`
-- `$ref` → `ref_`
-- `$id` → `id_`
-- `$schema` → `schema_`
+- `$ref` → `ref`
+- `$id` → `id`
+- `$schema` → `schema`
 
 ### Source Tracking
 

packages/jentic-openapi-datamodels/src/jentic/apitools/openapi/datamodels/low/v31/schema.py

@@ -46,9 +46,9 @@ class Schema:
         root_node: The top-level node representing the entire Schema object in the original source file
 
         # JSON Schema Core Keywords (2020-12)
-        schema_: The $schema keyword - URI of the meta-schema
-        id_: The $id keyword - URI that identifies the schema resource
-        ref_: The $ref keyword - URI reference to another schema
+        schema: The $schema keyword - URI of the meta-schema
+        id: The $id keyword - URI that identifies the schema resource
+        ref: The $ref keyword - URI reference to another schema
         anchor: The $anchor keyword - Plain name fragment for identification
         dynamic_ref: The $dynamicRef keyword - Dynamic reference to another schema
         dynamic_anchor: The $dynamicAnchor keyword - Dynamic anchor for identification
@@ -146,9 +146,9 @@ class Schema:
     root_node: yaml.Node
 
     # Core Keywords
-    id_: FieldSource[str] | None = fixed_field(metadata={"yaml_name": "$id"})
-    schema_: FieldSource[str] | None = fixed_field(metadata={"yaml_name": "$schema"})
-    ref_: FieldSource[str] | None = fixed_field(metadata={"yaml_name": "$ref"})
+    id: FieldSource[str] | None = fixed_field(metadata={"yaml_name": "$id"})
+    schema: FieldSource[str] | None = fixed_field(metadata={"yaml_name": "$schema"})
+    ref: FieldSource[str] | None = fixed_field(metadata={"yaml_name": "$ref"})
     comment: FieldSource[str] | None = fixed_field(metadata={"yaml_name": "$comment"})
     defs: FieldSource[dict[KeySource[str], NestedSchema]] | None = fixed_field(
         metadata={"yaml_name": "$defs"}