feat(inbound-meta): expose sender_id in trusted system metadata

Add sender_id (ctx.SenderId) to the openclaw.inbound_meta.v1 payload
so agents can reference it for moderation actions (delete, ban, etc.)
without relying on user-controlled text fields.

message_id and chat_id were already present; sender_id was the missing
piece needed for complete group moderation workflows.

src/auto-reply/reply/inbound-meta.test.ts

@@ -32,6 +32,35 @@ describe("buildInboundMetaSystemPrompt", () => {
     expect(payload["channel"]).toBe("telegram");
   });
 
+  it("includes sender_id when provided", () => {
+    const prompt = buildInboundMetaSystemPrompt({
+      MessageSid: "456",
+      SenderId: "289522496",
+      OriginatingTo: "telegram:-1001249586642",
+      OriginatingChannel: "telegram",
+      Provider: "telegram",
+      Surface: "telegram",
+      ChatType: "group",
+    } as TemplateContext);
+
+    const payload = parseInboundMetaPayload(prompt);
+    expect(payload["sender_id"]).toBe("289522496");
+  });
+
+  it("omits sender_id when not provided", () => {
+    const prompt = buildInboundMetaSystemPrompt({
+      MessageSid: "789",
+      OriginatingTo: "telegram:5494292670",
+      OriginatingChannel: "telegram",
+      Provider: "telegram",
+      Surface: "telegram",
+      ChatType: "direct",
+    } as TemplateContext);
+
+    const payload = parseInboundMetaPayload(prompt);
+    expect(payload["sender_id"]).toBeUndefined();
+  });
+
   it("keeps message_id_full only when it differs from message_id", () => {
     const prompt = buildInboundMetaSystemPrompt({
       MessageSid: "short-id",

src/auto-reply/reply/inbound-meta.ts

@@ -24,6 +24,7 @@ export function buildInboundMetaSystemPrompt(ctx: TemplateContext): string {
     schema: "openclaw.inbound_meta.v1",
     message_id: messageId,
     message_id_full: messageIdFull && messageIdFull !== messageId ? messageIdFull : undefined,
+    sender_id: safeTrim(ctx.SenderId),
     chat_id: chatId,
     reply_to_id: replyToId,
     channel: safeTrim(ctx.OriginatingChannel) ?? safeTrim(ctx.Surface) ?? safeTrim(ctx.Provider),