List Segmentation

Segment accounts into tiers based on hypothesis fit, signal strength, and data richness. Each tier gets different treatment in the email pipeline.

Key Difference from Extruct

Extruct tiers on enrichment data richness + hypothesis fit. We add:

1. Confidence scoring — our signal engine already scores accounts across 10 categories
2. SynthesisTrigger — auto/review/override decisions for enrichment escalation
3. Signal strength over time — accounts with growing signal counts rank higher

Tier Definitions

Tier 1: Full Personalization (10-20% of list)