FIX: Correct all tangle paths and regenerate Lisp sources

tests/llm-gateway-tests.lisp

@@ -0,0 +1,18 @@
+(defpackage :org-agent-llm-gateway-tests
+  (:use :cl :fiveam :org-agent))
+(in-package :org-agent-llm-gateway-tests)
+
+(def-suite llm-gateway-suite :description "Tests for the Unified LLM Gateway.")
+(in-suite llm-gateway-suite)
+
+(test test-credential-retrieval
+  "Ensure credentials are retrieved from the correct environment variables."
+  (uiop:setenv "ANTHROPIC_API_KEY" "sk-test-key")
+  (is (equal "sk-test-key" (org-agent::get-llm-credentials :anthropic)))
+  (uiop:setenv "ANTHROPIC_API_KEY" ""))
+
+(test test-error-handling-missing-key
+  "Ensure missing keys return a standardized error plist."
+  (let ((res (org-agent:execute-llm-request "test" "sys" :provider :openai)))
+    (is (eq (getf res :status) :error))
+    (is (search "API Key missing" (getf res :message)))))