Metternich Engine

Build the AI-powered game generation system that serves as the primary entry point for new users. A visitor types a game description on `/new` and receives a playable prototype in the real editor viewport in under 20 seconds, with zero signup. This is the single most important feature — the entire GTM plan, activation funnel, and acquisition model depend on it.

Instrument the top 3 metric gaps identified in `research/metrics.md` so that launch success is measurable from Week 0. Without this, the GTM plan flies blind — no activation rate, no play-to-signup conversion, no project activity tracking.

Add A* pathfinding on isometric grids as a first-class studio-iso feature. This is the #1 pain point for isometric game developers per ICP research — they currently implement pathfinding from scratch or find plugins in every engine. Shipping this before or alongside studio-iso launch strengthens the niche monopoly.

Give users tools to diagnose and fix performance issues before they hit the "performance ceiling" churn trigger — the #1 existential risk identified in the journey map. Phase Q added a developer-facing frame time overlay; this phase creates a user-facing profiling experience with actionable optimization guidance.

Build the automated re-engagement pipeline from the metrics framework's churn detection spec. 21-day tiered notifications prevent the "between-project gap" from becoming permanent churn. This is the defensive complement to the offensive GTM — acquisition without retention is a leaky bucket.