rigor-tiers

WellForge rigor tiers — match ceremony to stakes. The spike / mvp / production vocabulary that governs how much of the pipeline runs (agents, approval gates, models, quality gates, eval) for a feature. Use whenever running $wf-spike, when $wf-orchestrate or $wf-implement is given a --mode, when reading a feature's rigor: frontmatter, or when deciding how strict gates should be. Authoritative reference for the three tiers, the non-negotiable security floor, advisory-gate behavior, and the rigor precedence rule.