refactor(tm-core): migrate to Vitest and Biome, implement clean architecture

- Migrated from Jest to Vitest for faster test execution (~4.2s vs ~4.6-5s)
- Replaced ESLint and Prettier with Biome for unified, faster linting/formatting
- Implemented BaseProvider with Template Method pattern following clean code principles
- Created TaskEntity with business logic encapsulation
- Added TaskMasterCore facade as main entry point
- Implemented complete end-to-end listTasks functionality
- All 50 tests passing with improved performance

🤖 Generated with Claude Code

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

packages/tm-core/tests/unit/smoke.test.ts

@@ -3,26 +3,21 @@
  */
 
 import {
-	generateTaskId,
-	isValidTaskId,
-	formatDate,
+	PlaceholderParser,
 	PlaceholderProvider,
 	PlaceholderStorage,
-	PlaceholderParser,
-	TmCoreError,
-	TaskNotFoundError,
-	ValidationError,
 	StorageError,
-	version,
-	name
+	TaskNotFoundError,
+	TmCoreError,
+	ValidationError,
+	formatDate,
+	generateTaskId,
+	isValidTaskId,
+	name,
+	version
 } from '@/index';
 
-import type {
-	TaskId,
-	TaskStatus,
-	TaskPriority,
-	PlaceholderTask
-} from '@/types/index';
+import type { PlaceholderTask, TaskId, TaskPriority, TaskStatus } from '@/types/index';
 
 describe('tm-core smoke tests', () => {
 	describe('package metadata', () => {