Architectural decisions (fixed for v1)

First deliverable is Plant Laboratory, not the entire idle economy.
React/Vite frontend; Fastify backend; PostgreSQL; npm workspaces; Docker Compose; TypeScript across code.
Illustrated 2D original SVG primitives; pure deterministic renderer with optional PixiJS later only if performance demands.
Diploid fixed-locus genetics; explicit seed and versions; no bio-realism claims.
One demonstrator species (velvetleaf), other species supported by schema but not required before M4.
Two-parent controlled breeding, server authoritative and idempotent.
Single sandbox demo player, no auth or public release at MVP stage.
English UI for v1, sensible localization-ready keys later.
Simple focused tests over test-heavy process; acceptance gates must work.
No cloud API dependencies for game operation.