feat: create tm-core and apps/cli (#1093)

- add typescript
- add npm workspaces

.taskmaster/docs/MIGRATION-ROADMAP.md

@@ -0,0 +1,188 @@
+# Task Master Migration Roadmap
+
+## Overview
+Gradual migration from scripts-based architecture to a clean monorepo with separated concerns.
+
+## Architecture Vision
+
+```
+┌─────────────────────────────────────────────────┐
+│                  User Interfaces                 │
+├──────────┬──────────┬──────────┬────────────────┤
+│  @tm/cli │ @tm/mcp  │ @tm/ext  │  @tm/web      │
+│  (CLI)   │  (MCP)   │  (VSCode)│  (Future)     │
+└──────────┴──────────┴──────────┴────────────────┘
+                    │
+                    ▼
+        ┌──────────────────────┐
+        │      @tm/core        │
+        │  (Business Logic)    │
+        └──────────────────────┘
+```
+
+## Migration Phases
+
+### Phase 1: Core Extraction ✅ (In Progress)
+**Goal**: Move all business logic to @tm/core
+
+- [x] Create @tm/core package structure
+- [x] Move types and interfaces
+- [x] Implement TaskMasterCore facade
+- [x] Move storage adapters
+- [x] Move task services
+- [ ] Move AI providers
+- [ ] Move parser logic
+- [ ] Complete test coverage
+
+### Phase 2: CLI Package Creation 🚧 (Started)
+**Goal**: Create @tm/cli as a thin presentation layer
+
+- [x] Create @tm/cli package structure
+- [x] Implement Command interface pattern
+- [x] Create CommandRegistry
+- [x] Build legacy bridge/adapter
+- [x] Migrate list-tasks command
+- [ ] Migrate remaining commands one by one
+- [ ] Remove UI logic from core
+
+### Phase 3: Transitional Integration
+**Goal**: Use new packages in existing scripts without breaking changes
+
+```javascript
+// scripts/modules/commands.js gradually adopts new commands
+import { ListTasksCommand } from '@tm/cli';
+const listCommand = new ListTasksCommand();
+
+// Old interface remains the same
+programInstance
+  .command('list')
+  .action(async (options) => {
+    // Use new command internally
+    const result = await listCommand.execute(convertOptions(options));
+  });
+```
+
+### Phase 4: MCP Package
+**Goal**: Separate MCP server as its own package
+
+- [ ] Create @tm/mcp package
+- [ ] Move MCP server code
+- [ ] Use @tm/core for all logic
+- [ ] MCP becomes a thin RPC layer
+
+### Phase 5: Complete Migration
+**Goal**: Remove old scripts, pure monorepo
+
+- [ ] All commands migrated to @tm/cli
+- [ ] Remove scripts/modules/task-manager/*
+- [ ] Remove scripts/modules/commands.js
+- [ ] Update bin/task-master.js to use @tm/cli
+- [ ] Clean up dependencies
+
+## Current Transitional Strategy
+
+### 1. Adapter Pattern (commands-adapter.js)
+```javascript
+// Checks if new CLI is available and uses it
+// Falls back to legacy implementation if not
+export async function listTasksAdapter(...args) {
+  if (cliAvailable) {
+    return useNewImplementation(...args);
+  }
+  return useLegacyImplementation(...args);
+}
+```
+
+### 2. Command Bridge Pattern
+```javascript
+// Allows new commands to work in old code
+const bridge = new CommandBridge(new ListTasksCommand());
+const data = await bridge.run(legacyOptions); // Legacy style
+const result = await bridge.execute(newOptions); // New style
+```
+
+### 3. Gradual File Migration
+Instead of big-bang refactoring:
+1. Create new implementation in @tm/cli
+2. Add adapter in commands-adapter.js
+3. Update commands.js to use adapter
+4. Test both paths work
+5. Eventually remove adapter when all migrated
+
+## Benefits of This Approach
+
+1. **No Breaking Changes**: Existing CLI continues to work
+2. **Incremental PRs**: Each command can be migrated separately
+3. **Parallel Development**: New features can use new architecture
+4. **Easy Rollback**: Can disable new implementation if issues
+5. **Clear Separation**: Business logic (core) vs presentation (cli/mcp/etc)
+
+## Example PR Sequence
+
+### PR 1: Core Package Setup ✅
+- Create @tm/core
+- Move types and interfaces
+- Basic TaskMasterCore implementation
+
+### PR 2: CLI Package Foundation ✅
+- Create @tm/cli
+- Command interface and registry
+- Legacy bridge utilities
+
+### PR 3: First Command Migration
+- Migrate list-tasks to new system
+- Add adapter in scripts
+- Test both implementations
+
+### PR 4-N: Migrate Commands One by One
+- Each PR migrates 1-2 related commands
+- Small, reviewable changes
+- Continuous delivery
+
+### Final PR: Cleanup
+- Remove legacy implementations
+- Remove adapters
+- Update documentation
+
+## Testing Strategy
+
+### Dual Testing During Migration
+```javascript
+describe('List Tasks', () => {
+  it('works with legacy implementation', async () => {
+    // Force legacy
+    const result = await legacyListTasks(...);
+    expect(result).toBeDefined();
+  });
+
+  it('works with new implementation', async () => {
+    // Force new
+    const command = new ListTasksCommand();
+    const result = await command.execute(...);
+    expect(result.success).toBe(true);
+  });
+
+  it('adapter chooses correctly', async () => {
+    // Let adapter decide
+    const result = await listTasksAdapter(...);
+    expect(result).toBeDefined();
+  });
+});
+```
+
+## Success Metrics
+
+- [ ] All commands migrated without breaking changes
+- [ ] Test coverage maintained or improved
+- [ ] Performance maintained or improved
+- [ ] Cleaner, more maintainable codebase
+- [ ] Easy to add new interfaces (web, desktop, etc.)
+
+## Notes for Contributors
+
+1. **Keep PRs Small**: Migrate one command at a time
+2. **Test Both Paths**: Ensure legacy and new both work
+3. **Document Changes**: Update this roadmap as you go
+4. **Communicate**: Discuss in PRs if architecture needs adjustment
+
+This is a living document - update as the migration progresses!