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>

PROGRESS.md

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+# Synthesis — Development Progress
+
+> **Last updated:** 2026-02-12  
+> **Current phase:** Phase 0 ✅ → Ready for Phase 1
+
+---
+
+## Completed
+
+### Phase 0: Project Setup ✅
+- [x] Game Design Document (`synthesis-gdd.md`)
+- [x] Engine analysis and tech stack selection (`engine-analysis.md`)
+- [x] npm project + dependencies (Phaser 3, bitECS, TypeScript, Vite, Vitest)
+- [x] TypeScript strict config
+- [x] Vite config (HMR, chunk splitting)
+- [x] Phaser config (1280x720, pixel-art, arcade physics, top-down)
+- [x] BootScene with title screen
+- [x] Cursor rules (6 rules: project context, agent workflow, ECS, chemistry, Phaser, data)
+- [x] Implementation plan (`IMPLEMENTATION-PLAN.md`)
+- [x] Progress tracking (this file)
+
+---
+
+## In Progress
+
+_None — ready to begin Phase 1_
+
+---
+
+## Up Next: Phase 1 — Chemistry Engine
+
+- [ ] 1.1 Types and interfaces (`Element`, `Reaction`, `Compound`)
+- [ ] 1.2 Element data — 20 real elements (JSON)
+- [ ] 1.3 Element registry with lookup
+- [ ] 1.4 Reaction engine core
+- [ ] 1.5 Reaction data — 50 real reactions (JSON)
+- [ ] 1.6 Compound properties
+- [ ] 1.7 Unit tests (vitest)
+
+---
+
+## Blockers
+
+None
+
+---
+
+## Session Log
+
+| # | Date | Phase | Summary |
+|---|------|-------|---------|
+| 1 | 2026-02-12 | Phase 0 | Project setup complete: GDD, engine analysis, npm init, Phaser config, BootScene, cursor rules, implementation plan |