test-infra: re-enable 16 disabled server suites (jest DI + lib0 ESM) (#56)

16 suites were disabled via testPathIgnorePatterns due to two root causes: lib0
ESM not transformed (the @hocuspocus/server -> lib0/decoding.js chain) and stock
'should be defined' specs built via Test.createTestingModule without providers.
Add lib0 to transformIgnorePatterns; convert the 14 DI placeholders to direct
new X(...) instantiation with stub deps (keeping a real construct smoke test);
re-enable the suites. Also updates the public-share limiter test to assert the
fail-closed behavior from #62 (surfaced now that the suite runs). Full server
suite: 67 passed, 689 tests.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

apps/server/src/core/group/group.controller.spec.ts

@@ -1,17 +1,15 @@
-import { Test, TestingModule } from '@nestjs/testing';
 import { GroupController } from './group.controller';
-import { GroupService } from './services/group.service';
 
+// Direct instantiation with stub deps, mirroring the rest of these unit specs.
 describe('GroupController', () => {
   let controller: GroupController;
 
-  beforeEach(async () => {
-    const module: TestingModule = await Test.createTestingModule({
-      controllers: [GroupController],
-      providers: [GroupService],
-    }).compile();
-
-    controller = module.get<GroupController>(GroupController);
+  beforeEach(() => {
+    controller = new GroupController(
+      {} as any, // groupService
+      {} as any, // groupUserService
+      {} as any, // workspaceAbility
+    );
   });
 
   it('should be defined', () => {

apps/server/src/core/group/services/group.service.spec.ts

@@ -1,15 +1,22 @@
-import { Test, TestingModule } from '@nestjs/testing';
 import { GroupService } from './group.service';
 
+// Direct instantiation with stub deps. The Test.createTestingModule form failed
+// to resolve the @InjectKysely() connection token (and AUDIT_SERVICE) at
+// compile(); this smoke test only needs the service to construct.
 describe('GroupService', () => {
   let service: GroupService;
 
-  beforeEach(async () => {
-    const module: TestingModule = await Test.createTestingModule({
-      providers: [GroupService],
-    }).compile();
-
-    service = module.get<GroupService>(GroupService);
+  beforeEach(() => {
+    service = new GroupService(
+      {} as any, // groupRepo
+      {} as any, // groupUserRepo
+      {} as any, // spaceMemberRepo
+      {} as any, // groupUserService
+      {} as any, // watcherRepo
+      {} as any, // favoriteRepo
+      {} as any, // db
+      {} as any, // auditService
+    );
   });
 
   it('should be defined', () => {