0002 — Terraforming uses habitability points, not growth-rate percentages

Status

Folded into FEATURES/planets/terraforming.md (2026-06-19). Decided that terraforming adds fixed habitability_score points via a 5-level ladder (+10/+15/+20/+25/+30), persisted as flat columns on planets plus an active_events entry rather than a separate table.

Context

Arbitrated the habitability-points vs %-growth model for terraforming, and the flat-column-vs-separate-table persistence shape.

Folded into FEATURES/planets/terraforming.md. The durable rule now lives in that doc's prose; this record is retained for decision history per the append-only ADR policy.