fix(#338): Warn when VALKEY_PASSWORD not set

- Log security warning when Valkey password not configured
- Prominent warning in production environment
- Tests verify warning behavior for SEC-ORCH-15

Refs #338

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/orchestrator/src/valkey/valkey.service.spec.ts

@@ -82,6 +82,89 @@ describe("ValkeyService", () => {
     });
   });
 
+  describe("Security Warnings (SEC-ORCH-15)", () => {
+    it("should check NODE_ENV when VALKEY_PASSWORD not set in production", () => {
+      const configNoPassword = {
+        get: vi.fn((key: string, defaultValue?: unknown) => {
+          const config: Record<string, unknown> = {
+            "orchestrator.valkey.host": "localhost",
+            "orchestrator.valkey.port": 6379,
+            NODE_ENV: "production",
+          };
+          return config[key] ?? defaultValue;
+        }),
+      } as unknown as ConfigService;
+
+      // Create a service to trigger the warning
+      const testService = new ValkeyService(configNoPassword);
+      expect(testService).toBeDefined();
+
+      // Verify NODE_ENV was checked (warning path was taken)
+      expect(configNoPassword.get).toHaveBeenCalledWith("NODE_ENV", "development");
+    });
+
+    it("should check NODE_ENV when VALKEY_PASSWORD not set in development", () => {
+      const configNoPasswordDev = {
+        get: vi.fn((key: string, defaultValue?: unknown) => {
+          const config: Record<string, unknown> = {
+            "orchestrator.valkey.host": "localhost",
+            "orchestrator.valkey.port": 6379,
+            NODE_ENV: "development",
+          };
+          return config[key] ?? defaultValue;
+        }),
+      } as unknown as ConfigService;
+
+      const testService = new ValkeyService(configNoPasswordDev);
+      expect(testService).toBeDefined();
+
+      // Verify NODE_ENV was checked (warning path was taken)
+      expect(configNoPasswordDev.get).toHaveBeenCalledWith("NODE_ENV", "development");
+    });
+
+    it("should not check NODE_ENV when VALKEY_PASSWORD is configured", () => {
+      const configWithPassword = {
+        get: vi.fn((key: string, defaultValue?: unknown) => {
+          const config: Record<string, unknown> = {
+            "orchestrator.valkey.host": "localhost",
+            "orchestrator.valkey.port": 6379,
+            "orchestrator.valkey.password": "secure-password",
+            NODE_ENV: "production",
+          };
+          return config[key] ?? defaultValue;
+        }),
+      } as unknown as ConfigService;
+
+      const testService = new ValkeyService(configWithPassword);
+      expect(testService).toBeDefined();
+
+      // NODE_ENV should NOT be checked when password is set (warning path not taken)
+      expect(configWithPassword.get).not.toHaveBeenCalledWith("NODE_ENV", "development");
+    });
+
+    it("should default to development environment when NODE_ENV not set", () => {
+      const configNoEnv = {
+        get: vi.fn((key: string, defaultValue?: unknown) => {
+          const config: Record<string, unknown> = {
+            "orchestrator.valkey.host": "localhost",
+            "orchestrator.valkey.port": 6379,
+          };
+          // Return default value for NODE_ENV (simulating undefined env var)
+          if (key === "NODE_ENV") {
+            return defaultValue;
+          }
+          return config[key] ?? defaultValue;
+        }),
+      } as unknown as ConfigService;
+
+      const testService = new ValkeyService(configNoEnv);
+      expect(testService).toBeDefined();
+
+      // Should have checked NODE_ENV with default "development"
+      expect(configNoEnv.get).toHaveBeenCalledWith("NODE_ENV", "development");
+    });
+  });
+
   describe("Lifecycle", () => {
     it("should disconnect on module destroy", async () => {
       mockClient.disconnect.mockResolvedValue(undefined);