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openspec/changes/enterprise-gaming-r3f-character-vehicle/proposal.md

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+# OpenSpec Change: enterprise-gaming-r3f-character-vehicle
+
+- **Change ID**: enterprise-gaming-r3f-character-vehicle
+- **Package**: `@suaveplan/r3f-character-vehicle`
+- **Category**: gaming/character
+- **Target path**: `gaming/character/r3f-character-vehicle`
+- **Status**: PROPOSED
+- **Date**: 2026-04-24
+- **Reference spec**: `/mnt/s/web/suaveplan/enterprise/r3f-character-vehicle.md`
+
+---
+
+## Summary
+
+Deliver `@suaveplan/r3f-character-vehicle` on the genesis branch from scratch at enterprise quality. The package provides character-vehicle integration for React Three Fiber: enter/exit interactions (proximity detection → mount/dismount animation → authority transfer), smooth camera transition between character and vehicle modes, and driver pose IK (hands to steering wheel). A `CharacterVehicleSystem` FSM manages the `on-foot | entering | driving | exiting` state machine; `useCharacterVehicle()` exposes current state. Genesis adds structured errors, OTel state-change counter, and 100% coverage.
+
+---
+
+## Available workspace deps
+
+`@suaveplan/error`, `@suaveplan/fsm`, `@suaveplan/r3f-character`, `@suaveplan/r3f-vehicle`, `@suaveplan/ik-solver`, react, `@react-three/fiber`, `@react-three/drei`, three.
+
+---
+
+## Public API surface
+
+```ts
+function CharacterVehicleSystem(props: CharacterVehicleSystemProps): JSX.Element
+
+function useCharacterVehicle(): CharacterVehicleState
+// state: 'on-foot' | 'entering' | 'driving' | 'exiting'
+// nearestVehicle, activeVehicle
+// enterVehicle(), exitVehicle()
+```
+
+---
+
+## File layout
+
+```text
+gaming/character/r3f-character-vehicle/
+  package.json / tsconfig.json / vitest.config.ts
+  src/
+    index.ts / error-codes.ts
+    types/common.ts + md
+    core/fsm/ (ts + md + types + test + index)
+    context/character-vehicle-provider.tsx + md + test
+    hooks/use-character-vehicle.ts + md + test
+    components/
+      CharacterVehicleSystem/ (tsx + md + test + stories + index)
+  tests/integration.test.ts
+```