feat(FN-987): wire AgentStore to TaskExecutor in dashboard command

- Wire AgentStore into TaskExecutor initialization within dashboard.ts startup
- Add AgentStore mock to dashboard command tests for proper test coverage
- Update test mocks to reflect new AgentStore dependency injection

packages/cli/src/commands/__tests__/dashboard.test.ts

@@ -19,6 +19,7 @@ function makeMockStore() {
       openrouterModelSync: true,
     }),
     listTasks: vi.fn().mockResolvedValue([]),
+    getFusionDir: vi.fn().mockReturnValue("/tmp/test/.fusion"),
     on: vi.fn((event: string, handler: (...args: unknown[]) => void) => {
       emitter.on(event, handler);
     }),
@@ -38,6 +39,14 @@ vi.mock("@fusion/core", () => ({
     listSchedules: vi.fn().mockResolvedValue([]),
     getDueSchedules: vi.fn().mockResolvedValue([]),
   })),
+  AgentStore: vi.fn().mockImplementation(() => ({
+    init: vi.fn().mockResolvedValue(undefined),
+    createAgent: vi.fn(),
+    updateAgentState: vi.fn(),
+    listAgents: vi.fn().mockResolvedValue([]),
+    getAgent: vi.fn().mockResolvedValue(null),
+    deleteAgent: vi.fn(),
+  })),
 }));
 
 // ── Mock @fusion/dashboard ─────────────────────────────────────────────