fix(presence): stabilize instance identity

src/infra/system-presence.test.ts

@@ -0,0 +1,40 @@
+import { randomUUID } from "node:crypto";
+import { describe, expect, it } from "vitest";
+import {
+  listSystemPresence,
+  updateSystemPresence,
+  upsertPresence,
+} from "./system-presence.js";
+
+describe("system-presence", () => {
+  it("dedupes entries across sources by case-insensitive instanceId key", () => {
+    const instanceIdUpper = `AaBb-${randomUUID()}`.toUpperCase();
+    const instanceIdLower = instanceIdUpper.toLowerCase();
+
+    upsertPresence(instanceIdUpper, {
+      host: "clawdis-mac",
+      mode: "app",
+      instanceId: instanceIdUpper,
+      reason: "connect",
+    });
+
+    updateSystemPresence({
+      text: "Node: Peter-Mac-Studio (10.0.0.1) · app 2.0.0 · last input 5s ago · mode app · reason beacon",
+      instanceId: instanceIdLower,
+      host: "Peter-Mac-Studio",
+      ip: "10.0.0.1",
+      mode: "app",
+      version: "2.0.0",
+      lastInputSeconds: 5,
+      reason: "beacon",
+    });
+
+    const matches = listSystemPresence().filter(
+      (e) => (e.instanceId ?? "").toLowerCase() === instanceIdLower,
+    );
+    expect(matches).toHaveLength(1);
+    expect(matches[0]?.host).toBe("Peter-Mac-Studio");
+    expect(matches[0]?.ip).toBe("10.0.0.1");
+    expect(matches[0]?.lastInputSeconds).toBe(5);
+  });
+});