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/package.json

@@ -1,5 +1,5 @@
 {
-	"name": "@task-master/tm-core",
+	"name": "@tm/core",
 	"version": "1.0.0",
 	"description": "Core library for Task Master - TypeScript task management system",
 	"type": "module",
@@ -46,28 +46,27 @@
 	"scripts": {
 		"build": "tsup",
 		"dev": "tsup --watch",
-		"test": "jest",
-		"test:watch": "jest --watch",
-		"test:coverage": "jest --coverage",
-		"lint": "eslint src --ext .ts",
-		"format": "prettier --write \"src/**/*.ts\" \"tests/**/*.ts\"",
+		"test": "vitest run",
+		"test:watch": "vitest",
+		"test:coverage": "vitest run --coverage",
+		"lint": "biome check --write",
+		"lint:check": "biome check",
+		"lint:fix": "biome check --fix --unsafe",
+		"format": "biome format --write",
+		"format:check": "biome format",
 		"typecheck": "tsc --noEmit"
 	},
 	"dependencies": {
 		"zod": "^3.22.4"
 	},
 	"devDependencies": {
-		"@types/jest": "^29.5.12",
+		"@biomejs/biome": "^1.9.4",
 		"@types/node": "^20.11.30",
-		"@typescript-eslint/eslint-plugin": "^7.3.1",
-		"@typescript-eslint/parser": "^7.3.1",
-		"eslint": "^8.57.0",
-		"jest": "^29.7.0",
-		"prettier": "^3.2.5",
-		"ts-jest": "^29.1.2",
+		"@vitest/coverage-v8": "^2.0.5",
 		"ts-node": "^10.9.2",
 		"tsup": "^8.0.2",
-		"typescript": "^5.4.3"
+		"typescript": "^5.4.3",
+		"vitest": "^2.0.5"
 	},
 	"engines": {
 		"node": ">=18.0.0"