fix: add X-Hermes-Session-Id header to preserve tool context across turns (#240)

Fixes #237

When web-ui sends a chat message, it includes conversation_history with only
user and assistant messages — tool calls and tool results are filtered out.
Meanwhile, it sends session_id in the request body but does NOT pass the
X-Hermes-Session-Id header.

Without the header, the gateway falls back to using the incomplete
conversation_history from the body, so the AI agent loses context about
previous tool calls, especially after idle periods.

Fix: Pass X-Hermes-Session-Id as a request header so the gateway loads
complete session history from the session DB (including tool messages).

Co-authored-by: 356252190-star <356252190-star@users.noreply.github.com>

packages/client/src/api/hermes/chat.ts

@@ -41,9 +41,14 @@ export interface RunEvent {
 }
 
 export async function startRun(body: StartRunRequest): Promise<StartRunResponse> {
+  const headers: Record<string, string> = {}
+  if (body.session_id) {
+    headers['X-Hermes-Session-Id'] = body.session_id
+  }
   return request<StartRunResponse>('/api/hermes/v1/runs', {
     method: 'POST',
     body: JSON.stringify(body),
+    headers,
   })
 }