enhance-arch-boundaries — Architecture as a fitness function

Degree of freedom: MIXED — T1 is the priority. Recovering the model [HIGH freedom]; do-not-invent, shrink-only baseline, and deliberate-violation probes [LOW freedom — run exactly].

Codify the repo's intended structure as rules that block merge. Import spaghetti is how agents degrade architecture: each import looks locally reasonable, no single diff is wrong, and after forty sessions the layering is gone. A rule in AGENTS.md is advisory. A dependency-cruiser rule in the aggregator gate is physics.

This skill vs neighbors