Implements the complete Phase 0 spike for autonomous TDD workflow with orchestration architecture.
## What's New
### Core Services (tm-core)
- **PreflightChecker**: Validates environment prerequisites
- Test command detection from package.json
- Git working tree status validation
- Required tools availability (git, gh, node, npm)
- Default branch detection
- **TaskLoaderService**: Comprehensive task validation
- Task existence and structure validation
- Subtask dependency analysis with circular detection
- Execution order calculation via topological sort
- Helpful expansion suggestions for unready tasks
### CLI Command
- **autopilot command**: `tm autopilot <taskId> --dry-run`
- Displays complete execution plan without executing
- Shows preflight check results
- Lists subtasks in dependency order
- Preview RED/GREEN/COMMIT phases per subtask
- Registered in command registry
### Architecture Documentation
- **Phase 0 completion**: Marked tdd-workflow-phase-0-spike.md as complete
- **Orchestration model**: Added execution model section to main workflow doc
- Clarifies orchestrator guides AI sessions vs direct execution
- WorkflowOrchestrator API design (getNextWorkUnit, completeWorkUnit)
- State machine approach for phase transitions
- **Phase 1 roadmap**: New tdd-workflow-phase-1-orchestrator.md
- Detailed state machine specifications
- MCP integration plan with new tool definitions
- Implementation checklist with 6 clear steps
- Example usage flows
## Technical Details
**Preflight Checks**:
- ✅ Test command detection
- ✅ Git working tree status
- ✅ Required tools validation
- ✅ Default branch detection
**Task Validation**:
- ✅ Task existence check
- ✅ Status validation (no completed/cancelled tasks)
- ✅ Subtask presence validation
- ✅ Dependency resolution with circular detection
- ✅ Execution order calculation
**Architecture Decision**:
Adopted orchestration model where WorkflowOrchestrator maintains state and generates work units, while Claude Code (via MCP) executes the actual work. This provides:
- Clean separation of concerns
- Human-in-the-loop capability
- Simpler implementation (no AI integration in orchestrator)
- Flexible executor support
## Out of Scope (Phase 0)
- Actual test generation
- Actual code implementation
- Git operations (commits, branches, PR)
- Test execution
→ All deferred to Phase 1
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
