feat: add agentId field to HookAgentPayload and implement normalization

src/gateway/hooks.ts

@@ -137,6 +137,7 @@ export type HookAgentPayload = {
   model?: string;
   thinking?: string;
   timeoutSeconds?: number;
+    agentId?: string;
 };
 
 const listHookChannelValues = () => ["last", ...listChannelPlugins().map((plugin) => plugin.id)];
@@ -195,7 +196,9 @@ export function normalizeAgentPayload(
   const timeoutSeconds =
     typeof timeoutRaw === "number" && Number.isFinite(timeoutRaw) && timeoutRaw > 0
       ? Math.floor(timeoutRaw)
-      : undefined;
+      : un
+      const agentIdRaw = payload.agentId;
+  const agentId = typeof agentIdRaw === "string" && agentIdRaw.trim() ? agentIdRaw.trim() : undefined;defined;
   return {
     ok: true,
     value: {
@@ -209,6 +212,7 @@ export function normalizeAgentPayload(
       model,
       thinking,
       timeoutSeconds,
+                agentId,
     },
   };
 }