# Changelog 74: Router Tower Workflow

**Date:** 2025-12-01
**Type:** Feature
**Task:** TASK-039-20

## Summary

Implemented the Tower Workflow for creating tower, pillar, and column structures with optional taper effect.

## Changes

### New/Updated Files

- `server/router/application/workflows/tower_workflow.py` - Full implementation
- `tests/unit/router/application/workflows/test_workflows.py` - Tests

### Features

1. **Workflow Steps**
   - 5-8 step workflow (depending on taper)
   - Cube primitive → Scale → Subdivide → Taper

2. **Customizable Parameters**
   - base_size, height
   - subdivisions
   - taper_factor, add_taper

3. **Predefined Variants**
   - obelisk (sharp taper 0.4)
   - pillar (slight taper 0.9)
   - chimney (no taper)
   - spire (very pointed 0.1)

4. **Pattern Matching**
   - Trigger pattern: `tower_like`
   - Keywords: tower, pillar, column, obelisk, spire, etc.

### API

```python
from server.router.application.workflows import tower_workflow

# With default taper
steps = tower_workflow.get_steps()

# Without taper
steps = tower_workflow.get_steps({"add_taper": False})

# Get spire variant
spire_params = tower_workflow.get_variant("spire")
```

## Test Coverage

- 8 unit tests for TowerWorkflow
- All tests passing

## Related

- Part of Phase 5: Workflows & Patterns
