test(macos): boost Clawdis coverage to 40%

apps/macos/Tests/ClawdisIPCTests/AgentEventStoreTests.swift

@@ -0,0 +1,43 @@
+import Foundation
+import Testing
+@testable import Clawdis
+
+@Suite
+@MainActor
+struct AgentEventStoreTests {
+    @Test
+    func appendAndClear() {
+        let store = AgentEventStore()
+        #expect(store.events.isEmpty)
+
+        store.append(ControlAgentEvent(
+            runId: "run",
+            seq: 1,
+            stream: "test",
+            ts: 0,
+            data: [:] as [String: AnyCodable],
+            summary: nil))
+        #expect(store.events.count == 1)
+
+        store.clear()
+        #expect(store.events.isEmpty)
+    }
+
+    @Test
+    func trimsToMaxEvents() {
+        let store = AgentEventStore()
+        for i in 1...401 {
+            store.append(ControlAgentEvent(
+                runId: "run",
+                seq: i,
+                stream: "test",
+                ts: Double(i),
+                data: [:] as [String: AnyCodable],
+                summary: nil))
+        }
+
+        #expect(store.events.count == 400)
+        #expect(store.events.first?.seq == 2)
+        #expect(store.events.last?.seq == 401)
+    }
+}