The Constraint Set is the key mechanic.
Before any CRO fix reaches the output, it's checked against explicit resolution rules:
H1 conflicts? Lead with emotion, embed keyword naturally.
Nav links? Keep them. Reduce visual weight instead of removing.
Internal links? Remove decorative only — never architectural.
Every fix tagged: ✅ SEO-safe · ⚠️ SEO-constrained · 🚫 SEO-blocked