Gated build — adversarial multi-agent construction

For work where being plausibly wrong is expensive. One agent can't reliably catch its own errors — the blind spot that produced the bug reviews the bug. Quality comes from independence: a second agent whose job is NO-AGREE, grilling every step to an explicit APPROVED.

Economics: compress everything agents read (specs, notes, grill prompts) so you can afford a second agent to disagree. Efficiency funds redundancy.

1. Casting the roles → CASTING.md

Three roles: Orchestrator (holds anchor doc, casts, integrates), Author (drafts), Reviewer (grills to APPROVED). Cast by task, not habit.