Phase 0: Project setup for agent-driven development

- Phaser 3 + bitECS 0.4 + TypeScript + Vite stack
- BootScene with title screen
- 6 cursor rules (project context, agent workflow, ECS, chemistry, Phaser, data)
- Vitest configured with happy-dom
- GDD, engine analysis, implementation plan, progress tracking

Co-authored-by: Cursor <cursoragent@cursor.com>

.cursor/rules/project-context.mdc

@@ -0,0 +1,28 @@
+---
+description: Core project context for Synthesis — scientific roguelike
+alwaysApply: true
+---
+
+# Synthesis — Project Context
+
+## What Is This
+2D scientific roguelike (TypeScript + Phaser 3 + bitECS + Vite). Real science replaces magic. Player combines real chemical elements, builds mechanisms using physics, tames creatures through biology, manipulates NPCs via cognitive biases.
+
+## Architecture
+- **Phaser 3** — rendering, physics, input, audio, scenes
+- **bitECS** — entity-component-system for game logic (TypedArrays, systems = pure functions)
+- **Vite** — build + HMR
+- Phaser handles rendering; bitECS handles logic. They sync via a bridge layer.
+
+## Key Files
+- `synthesis-gdd.md` — Game Design Document (source of truth for ALL design decisions)
+- `engine-analysis.md` — Technical stack rationale
+- `IMPLEMENTATION-PLAN.md` — Phased development roadmap
+- `PROGRESS.md` — Current status (**update after completing tasks**)
+
+## Design Principles
+1. All science must be **real** (simplified, never wrong)
+2. Every failed experiment teaches WHY it failed
+3. Death is a feature, not punishment — it's a cycle phase
+4. Cycles everywhere: gameplay, visuals, audio, narrative
+5. Data-driven: game data in `src/data/*.json`, logic in TypeScript