Architecture Scaffold

Turn a high-level architecture spec into a compilable type skeleton, then prove it's sound with the compiler before anyone writes a line of logic.

Why This Exists

Large refactors fail when agents jump straight to implementation. They lose the thread, make local decisions that contradict the global design, and you end up with a different mess than the one you started with. The "Human Builds the Shell" paradigm (Mengdi Chen, 2026) solves this by separating structure from logic:

1. Types are hard constraints — the compiler rejects violations at build time
2. Tests are behavioral verification — they confirm what the code does at runtime
3. Specs are soft guidance — they inform but can't enforce

This skill operates at layer 1. By the time you're done, every module, every function signature, every protocol/trait, and every type relationship exists as real code that the compiler has verified. No logic yet — just the architectural skeleton. An agent literally cannot hallucinate past a compiler error.

The Three Phases

Phase 1: Extract the Target Architecture

Read the spec. Produce a structured outline of every module, type, and signature.