# Project Retrospective

*A living document updated after each milestone. Lessons feed forward into future planning.*

## Milestone: v{version} - {name}

**Shipped:** {date}
**Phases:** {count} | **Plans:** {count} | **Sessions:** {count}

### What Was Built
- {Key deliverable 1}
- {Key deliverable 2}
- {Key deliverable 3}

### What Worked
- {Efficiency win or successful pattern}
- {What went smoothly}

### What Was Inefficient
- {Missed opportunity}
- {What took longer than expected}

### Patterns Established
- {New pattern or convention that should persist}

### Key Lessons
1. {Specific, actionable lesson}
2. {Another lesson}

### Cost Observations
- Model mix: {X}% opus, {Y}% sonnet, {Z}% haiku
- Sessions: {count}
- Notable: {efficiency observation}

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## Cross-Milestone Trends

### Process Evolution

| Milestone | Sessions | Phases | Key Change                |
| --------- | -------- | ------ | ------------------------- |
| v{X}      | {N}      | {M}    | {What changed in process} |

### Cumulative Quality

| Milestone | Tests | Coverage | Zero-Dep Additions |
| --------- | ----- | -------- | ------------------ |
| v{X}      | {N}   | {Y}%     | {count}            |

### Top Lessons (Verified Across Milestones)

1. {Lesson verified by multiple milestones}
2. {Another cross-validated lesson}