Added a DocC catalog coverage check.

Makefile

@@ -82,6 +82,9 @@ doc-generate-github: ## Generates the library documentation for Github
 		--hosting-base-path $(DOCC_GITHUB_BASE_PATH) \
 		--output-path $(DOCC_GITHUB_OUTPUT)
 
+doc-check: ## Checks the DocC catalog covers every generated operation and schema
+	@python3 -I Scripts/check-docc.py "$(OAS_GENERATE_OUTPUT)" "$(DOCC_CATALOG)"
+
 doc-preview: ## Previews the library documentation in Safari
 	@open -a safari $(DOCC_PREVIEW_URL)
 	@ENABLE_DOCC_PLUGIN=1 swift package \
@@ -101,13 +104,16 @@ oas-download: ## Downloads the latest App Store Connect OpenAPI specification do
 	@unzip -q "$(OAS_DOWNLOAD_INPUT)" -d "$(OAS_DOWNLOAD_FOLDER)"
 	@mv "$(OAS_DOWNLOAD_FILE)" "$(OAS_DOWNLOAD_OUTPUT)"
 	@rm -rf "$(OAS_DOWNLOAD_FOLDER)"
-	@$(MAKE) --no-print-directory oas-patch
+	@# Generating the code also validates the document.
+	@$(MAKE) --no-print-directory oas-patch-document
 	@$(MAKE) --no-print-directory oas-generate
+	@$(MAKE) --no-print-directory doc-check
 
-oas-patch: # Patches the OpenAPI specification document with the patches in Scripts/patch-oas.jq
+oas-patch: oas-patch-document oas-validate # Patches and validates the OpenAPI specification document
+
+oas-patch-document: # Patches the OpenAPI specification document with Scripts/patch-oas.jq
 	@jq --from-file Scripts/patch-oas.jq "$(OAS_DOWNLOAD_OUTPUT)" > "$(OAS_DOWNLOAD_OUTPUT).tmp"
 	@mv "$(OAS_DOWNLOAD_OUTPUT).tmp" "$(OAS_DOWNLOAD_OUTPUT)"
-	@$(MAKE) --no-print-directory oas-validate
 
 oas-validate: ## Validates the OpenAPI specification document
 	@swift run \