Align the spell response schema

internal/modules/dnd/extract/spells/assets/schemas/dnd_spells_llm.v1.json

@@ -1,6 +1,6 @@
 {
   "$schema": "https://json-schema.org/draft/2020-12/schema",
-  "$id": "notarius.dnd.spells.llm",
+  "$id": "notarius.dnd.spells",
   "type": "object",
   "additionalProperties": false,
   "required": ["spell_casts"],

internal/modules/dnd/extract/spells/schema_test.go

@@ -20,6 +20,13 @@ func TestLoadResponseSchemaUsesExtractorOwnedLLMSchema(t *testing.T) {
 	if !strings.HasPrefix(schema.SHA256, "sha256:") || !json.Valid(schema.JSONSchema) {
 		t.Fatalf("schema metadata = %#v, want valid hashed JSON", schema)
 	}
+	var schemaDocument map[string]any
+	if err := json.Unmarshal(schema.JSONSchema, &schemaDocument); err != nil {
+		t.Fatalf("Unmarshal(schema.JSONSchema) error = %v, want nil", err)
+	}
+	if schemaDocument["$id"] != ResponseSchemaID {
+		t.Fatalf("schema $id = %#v, want %q", schemaDocument["$id"], ResponseSchemaID)
+	}
 
 	valid := validSpellsResponse()
 	validJSON, err := json.Marshal(valid)