feat(api): add agent memory module (MS22-DB-002, MS22-API-002)

- Add AgentMemory model to schema.prisma with workspaceId/agentId/key/value
  and @@unique([workspaceId, agentId, key]) constraint
- Add Workspace.agentMemories relation
- Add migration 20260228000000_ms22_agent_memory
- Add AgentMemoryModule with service, controller, DTOs, and unit tests
- Endpoints: PUT/GET/GET/:key/DELETE on /api/agents/:agentId/memory/:key
- Register AgentMemoryModule in app.module.ts
- 10 unit tests passing (service + controller)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

apps/api/src/agent-memory/agent-memory.controller.spec.ts

@@ -0,0 +1,102 @@
+import { Test, TestingModule } from "@nestjs/testing";
+import { AgentMemoryController } from "./agent-memory.controller";
+import { AgentMemoryService } from "./agent-memory.service";
+import { AuthGuard } from "../auth/guards/auth.guard";
+import { WorkspaceGuard, PermissionGuard } from "../common/guards";
+import { describe, it, expect, beforeEach, vi } from "vitest";
+
+describe("AgentMemoryController", () => {
+  let controller: AgentMemoryController;
+
+  const mockAgentMemoryService = {
+    upsert: vi.fn(),
+    findAll: vi.fn(),
+    findOne: vi.fn(),
+    remove: vi.fn(),
+  };
+
+  const mockGuard = { canActivate: vi.fn(() => true) };
+
+  beforeEach(async () => {
+    const module: TestingModule = await Test.createTestingModule({
+      controllers: [AgentMemoryController],
+      providers: [
+        {
+          provide: AgentMemoryService,
+          useValue: mockAgentMemoryService,
+        },
+      ],
+    })
+      .overrideGuard(AuthGuard)
+      .useValue(mockGuard)
+      .overrideGuard(WorkspaceGuard)
+      .useValue(mockGuard)
+      .overrideGuard(PermissionGuard)
+      .useValue(mockGuard)
+      .compile();
+
+    controller = module.get<AgentMemoryController>(AgentMemoryController);
+
+    vi.clearAllMocks();
+  });
+
+  const workspaceId = "workspace-1";
+  const agentId = "agent-1";
+  const key = "context";
+
+  describe("upsert", () => {
+    it("should upsert a memory entry", async () => {
+      const dto = { value: { foo: "bar" } };
+      const mockEntry = { id: "mem-1", workspaceId, agentId, key, value: dto.value };
+
+      mockAgentMemoryService.upsert.mockResolvedValue(mockEntry);
+
+      const result = await controller.upsert(agentId, key, dto, workspaceId);
+
+      expect(mockAgentMemoryService.upsert).toHaveBeenCalledWith(workspaceId, agentId, key, dto);
+      expect(result).toEqual(mockEntry);
+    });
+  });
+
+  describe("findAll", () => {
+    it("should list all memory entries for an agent", async () => {
+      const mockEntries = [
+        { id: "mem-1", key: "a", value: 1 },
+        { id: "mem-2", key: "b", value: 2 },
+      ];
+
+      mockAgentMemoryService.findAll.mockResolvedValue(mockEntries);
+
+      const result = await controller.findAll(agentId, workspaceId);
+
+      expect(mockAgentMemoryService.findAll).toHaveBeenCalledWith(workspaceId, agentId);
+      expect(result).toEqual(mockEntries);
+    });
+  });
+
+  describe("findOne", () => {
+    it("should get a single memory entry", async () => {
+      const mockEntry = { id: "mem-1", key, value: "v" };
+
+      mockAgentMemoryService.findOne.mockResolvedValue(mockEntry);
+
+      const result = await controller.findOne(agentId, key, workspaceId);
+
+      expect(mockAgentMemoryService.findOne).toHaveBeenCalledWith(workspaceId, agentId, key);
+      expect(result).toEqual(mockEntry);
+    });
+  });
+
+  describe("remove", () => {
+    it("should delete a memory entry", async () => {
+      const mockResponse = { message: "Memory entry deleted successfully" };
+
+      mockAgentMemoryService.remove.mockResolvedValue(mockResponse);
+
+      const result = await controller.remove(agentId, key, workspaceId);
+
+      expect(mockAgentMemoryService.remove).toHaveBeenCalledWith(workspaceId, agentId, key);
+      expect(result).toEqual(mockResponse);
+    });
+  });
+});