support toolhook (#125)

specs.json

@@ -1383,7 +1383,8 @@
       "llm": "#llm",
       "preflightLlm": "boolean",
       "actionHook": "object|string",
-      "eventHook": "object|string"
+      "eventHook": "object|string",
+      "toolHook": "object|string"
     },
     "required": [
       "stt",

test/jambonz-verb-test.js

@@ -664,6 +664,26 @@ test("validate correct verbs", async (t) => {
         }
       ]
     },
+    {
+      "verb": "pipeline",
+      "stt": {
+        "vendor": "google",
+        "language": "en-US"
+      },
+      "tts": {
+        "vendor": "google",
+        "language": "en-US"
+      },
+      "llm": {
+        "vendor": "openai",
+        "llmOptions": {
+          "model": "gpt-4o"
+        }
+      },
+      "actionHook": "/pipeline/action",
+      "eventHook": "/pipeline/event",
+      "toolHook": "/pipeline/tool"
+    },
     {
       "verb": "transcribe",
       "transcriptionHook": "http://example.com/transcribe",