feat(chat): add typed change-set summary message in timeline

Frontend/server/api/pilot-chat.post.ts

@@ -4,6 +4,7 @@ import { getAuthContext } from "../utils/auth";
 import { prisma } from "../utils/prisma";
 import { buildChangeSet, captureSnapshot } from "../utils/changeSet";
 import { persistChatMessage, runCrmAgentFor, type AgentTraceEvent } from "../agent/crmAgent";
+import type { ChangeSet } from "../utils/changeSet";
 
 function extractMessageText(message: any): string {
   if (!message || !Array.isArray(message.parts)) return "";
@@ -37,6 +38,28 @@ function humanizeTraceText(trace: AgentTraceEvent): string {
   return text;
 }
 
+function renderChangeSetSummary(changeSet: ChangeSet): string {
+  const totals = { created: 0, updated: 0, deleted: 0 };
+  for (const item of changeSet.items) {
+    if (item.action === "created") totals.created += 1;
+    else if (item.action === "updated") totals.updated += 1;
+    else if (item.action === "deleted") totals.deleted += 1;
+  }
+
+  const byEntity = new Map<string, number>();
+  for (const item of changeSet.items) {
+    byEntity.set(item.entity, (byEntity.get(item.entity) ?? 0) + 1);
+  }
+
+  const lines = [
+    "Technical change summary",
+    `Total: ${changeSet.items.length} · Created: ${totals.created} · Updated: ${totals.updated} · Archived: ${totals.deleted}`,
+    ...[...byEntity.entries()].map(([entity, count]) => `- ${entity}: ${count}`),
+  ];
+
+  return lines.join("\n");
+}
+
 export default defineEventHandler(async (event) => {
   const auth = await getAuthContext(event);
   const body = await readBody<{ messages?: any[] }>(event);
@@ -98,9 +121,24 @@ export default defineEventHandler(async (event) => {
           eventType: "assistant",
           phase: "final",
           transient: false,
-          changeSet,
         });
 
+        if (changeSet) {
+          await persistChatMessage({
+            teamId: auth.teamId,
+            conversationId: auth.conversationId,
+            authorUserId: null,
+            role: "ASSISTANT",
+            text: renderChangeSetSummary(changeSet),
+            requestId,
+            eventType: "note",
+            phase: "final",
+            transient: false,
+            messageKind: "change_set_summary",
+            changeSet,
+          });
+        }
+
         writer.write({ type: "text-start", id: textId });
         writer.write({ type: "text-delta", id: textId, delta: reply.text });
         writer.write({ type: "text-end", id: textId });