# Delta Interpretation

**Kata ID:** C1-capability-growth-boundary
**Cold Run:** C1-cold-001
**Selected Run:** C1-selected-001

## What improved

### α: 2 → 4

The selected-skills run moved from "plugin-ish intuition" to a real architecture artifact.

### β: 2 → 4

This is the strongest gain. The selected-skills run clearly separated:

- runtime extension layer
- registry/ecosystem layer
- bundle/app layer

### γ: 2 → 4

The selected-skills run added a clean phased migration instead of stopping at an abstract preference.

### Efficiency: 4 → 3

The answer became costlier, but the gain in architectural clarity was substantial.

## Failure-shape change

**Cold:**
- good instinct
- weak articulation
- layer collapse risk

**Selected:**
- explicit challenged assumption
- real boundary comparison
- leverage / negative leverage
- process cost priced
- migration articulated

## Provisional conclusion

For this kata family, design + architecture-evolution + process-economics is a strong governing-skill set. The main signal is not merely "better answer," but that the answer now changes the system boundary coherently instead of just choosing a feature direction.
