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openspec/changes/enterprise-gaming-r3f-particles/proposal.md

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+# OpenSpec Change: enterprise-gaming-r3f-particles
+
+- **Change ID**: enterprise-gaming-r3f-particles
+- **Package**: `@suaveplan/r3f-particles`
+- **Category**: gaming/effects
+- **Target path**: `gaming/effects/r3f-particles`
+- **Status**: PROPOSED
+- **Date**: 2026-04-24
+
+---
+
+## Summary
+
+Deliver `@suaveplan/r3f-particles` on the genesis branch from scratch at enterprise quality. The package provides GPU-accelerated particle systems for React Three Fiber using `InstancedMesh`. A `ParticleSystem` manages a fixed-size particle pool with configurable spawn rate, lifetime, initial velocity spread, gravity, and color-over-lifetime; a `ParticleEmitter` component controls burst/continuous emission; preset effects include muzzle flash, explosion, smoke, and magic sparkles. Genesis adds Zod emitter config schemas, structured errors, OTel active-particle gauge, and 100% coverage.
+
+---
+
+## Available workspace deps
+
+`@suaveplan/error`, `@suaveplan/types`, react, `@react-three/fiber`, `@react-three/drei`, three.
+
+---
+
+## Public API surface
+
+```ts
+function ParticleEmitter(props: ParticleEmitterProps): JSX.Element
+// preset | config, rate, burst, position, direction, onEmpty
+
+function useParticleSystem(): ParticleSystemHandle
+// emit(count, origin, velocity): void; clear(): void
+
+// Preset effects
+const PARTICLE_PRESETS: Record<'muzzle_flash' | 'explosion' | 'smoke' | 'sparkles', ParticleConfig>
+```
+
+---
+
+## File layout
+
+```text
+gaming/effects/r3f-particles/
+  package.json / tsconfig.json / vitest.config.ts
+  src/
+    index.ts / error-codes.ts
+    types/common.ts + md
+    core/
+      particle-system/ (ts + md + types + test + index)
+    presets/index.ts
+    components/
+      ParticleEmitter/ (tsx + md + test + stories + index)
+    hooks/use-particle-system.ts + md + test
+  tests/integration.test.ts
+```