fix(runtime): preserve inbound correlations for active runs

tests/unit/inbound-correlation-registry.test.ts

@@ -0,0 +1,50 @@
+import { describe, expect, it } from "vitest";
+import { InboundCorrelationRegistryStore } from "../../src/main/agent-runtime/inbound-correlation-registry";
+import type { AgentMessageRecord } from "../../src/shared/types";
+
+function makeMessage(index: number): AgentMessageRecord {
+  return {
+    id: `message-${index}`,
+    companyId: "company-1",
+    fromAgentId: `agent-${index}`,
+    toAgentId: "agent-recipient",
+    senderKind: "agent",
+    channel: "direct",
+    channelTargetId: null,
+    subject: `message ${index}`,
+    body: `body ${index}`,
+    priority: "normal",
+    readAt: null,
+    parentMessageId: null,
+    attachmentsJson: "[]",
+    createdAt: "2026-04-22T00:00:00.000Z",
+  };
+}
+
+describe("InboundCorrelationRegistryStore", () => {
+  it("preserves every inbound correlation for the active run", () => {
+    const store = new InboundCorrelationRegistryStore();
+    const timestamps: number[] = [];
+
+    for (let i = 0; i < 700; i += 1) {
+      timestamps.push(store.register("run-1", makeMessage(i), 1_000));
+    }
+
+    expect(new Set(timestamps).size).toBe(700);
+    for (let i = 0; i < timestamps.length; i += 1) {
+      expect(store.lookup("run-1", timestamps[i])).toMatchObject({
+        fromAgentId: `agent-${i}`,
+        messageId: `message-${i}`,
+      });
+    }
+  });
+
+  it("drops correlations only when the run is released", () => {
+    const store = new InboundCorrelationRegistryStore();
+    const timestamp = store.register("run-1", makeMessage(1), 1_000);
+
+    expect(store.lookup("run-1", timestamp)?.messageId).toBe("message-1");
+    store.deleteRun("run-1");
+    expect(store.lookup("run-1", timestamp)).toBeNull();
+  });
+});