fix(chat): preserve sender labels in dashboard history

src/gateway/chat-sanitize.test.ts

@@ -66,8 +66,9 @@ describe("stripEnvelopeFromMessage", () => {
       content:
         'Thread starter (untrusted, for context):\n```json\n{"seed": 1}\n```\n\nSender (untrusted metadata):\n```json\n{"name": "alice"}\n```\n\nActual user message',
     };
-    const result = stripEnvelopeFromMessage(input) as { content?: string };
+    const result = stripEnvelopeFromMessage(input) as { content?: string; senderLabel?: string };
     expect(result.content).toBe("Actual user message");
+    expect(result.senderLabel).toBe("alice");
   });
 
   test("strips metadata-like blocks even when not a prefix", () => {

src/gateway/chat-sanitize.ts

@@ -1,8 +1,39 @@
-import { stripInboundMetadata } from "../auto-reply/reply/strip-inbound-meta.js";
+import {
+  extractInboundSenderLabel,
+  stripInboundMetadata,
+} from "../auto-reply/reply/strip-inbound-meta.js";
 import { stripEnvelope, stripMessageIdHints } from "../shared/chat-envelope.js";
 
 export { stripEnvelope };
 
+function extractMessageSenderLabel(entry: Record<string, unknown>): string | null {
+  if (typeof entry.senderLabel === "string" && entry.senderLabel.trim()) {
+    return entry.senderLabel.trim();
+  }
+  if (typeof entry.content === "string") {
+    return extractInboundSenderLabel(entry.content);
+  }
+  if (Array.isArray(entry.content)) {
+    for (const item of entry.content) {
+      if (!item || typeof item !== "object") {
+        continue;
+      }
+      const text = (item as { text?: unknown }).text;
+      if (typeof text !== "string") {
+        continue;
+      }
+      const senderLabel = extractInboundSenderLabel(text);
+      if (senderLabel) {
+        return senderLabel;
+      }
+    }
+  }
+  if (typeof entry.text === "string") {
+    return extractInboundSenderLabel(entry.text);
+  }
+  return null;
+}
+
 function stripEnvelopeFromContentWithRole(
   content: unknown[],
   stripUserEnvelope: boolean,
@@ -42,6 +73,11 @@ export function stripEnvelopeFromMessage(message: unknown): unknown {
 
   let changed = false;
   const next: Record<string, unknown> = { ...entry };
+  const senderLabel = stripUserEnvelope ? extractMessageSenderLabel(entry) : null;
+  if (senderLabel && entry.senderLabel !== senderLabel) {
+    next.senderLabel = senderLabel;
+    changed = true;
+  }
 
   if (typeof entry.content === "string") {
     const inboundStripped = stripInboundMetadata(entry.content);