powder-and-steppe — SPEC.md

# Powder & Steppe — flagship
A touch-first mobile-web RTS that keeps the soul of Cossacks — huge massed armies, an economy of resource chains where muskets literally eat coal and soldiers literally eat food, and a base that sprawls into an empire — while replacing every 2001 execution tax (edge scroll, right-click, peasant babysitting, hotkey sprawl) with company-banner armies, slot-based labor allocation, and one-tap attack-move that automatically SEIZES unguarded economy instead of burning it. Two asymmetric nations (the disciplined gunpowder Line vs the raiding, capture-hungry Tide) fight one full deterministic match against a data-driven AI, all in a single index.html whose sim runs headless in Node.

## done_when
- Zero console errors at 390px and desktop (Puppeteer gate)
- Full match winnable AND losable vs AI, touch-only (headless match tests + human device test)
- Sim tests pass; same inputs -> same state hash (determinism tests)
- GROWTH.md, DECISIONS.md, HANDOFF.md exist and are accurate
- guardrails/verify.sh exit 0