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

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+# OpenSpec Change: enterprise-gaming-r3f-inventory
+
+- **Change ID**: enterprise-gaming-r3f-inventory
+- **Package**: `@suaveplan/r3f-inventory`
+- **Category**: gaming/gameplay
+- **Target path**: `gaming/gameplay/r3f-inventory`
+- **Status**: PROPOSED
+- **Date**: 2026-04-24
+
+---
+
+## Summary
+
+Deliver `@suaveplan/r3f-inventory` on the genesis branch from scratch at enterprise quality. The package provides a 3D grid-based inventory rendered inside a React Three Fiber scene or as an HTML overlay: `InventoryGrid` with configurable cell size and slot count, `ItemMesh` showing a 3D model preview of each item, `EquipmentSlots` with body-region anchors, `LootTable` drop-chance visualization, and `useInventory()` backed by a framework-agnostic `InventoryManager`. Drag-and-drop reordering, stack splitting, and equipment slot restriction rules are enforced by the manager. Genesis adds 100% coverage and Storybook stories.
+
+---
+
+## Available workspace deps
+
+`@suaveplan/error`, `@suaveplan/types`, `@suaveplan/events`, react, `@react-three/fiber`, `@react-three/drei`, three.
+
+---
+
+## Public API surface
+
+```ts
+interface InventoryItem {
+  id: string
+  name: string
+  stackSize: number
+  maxStack: number
+  equipSlot?: EquipmentSlot
+  modelUrl?: string
+  iconUrl?: string
+}
+
+type EquipmentSlot = 'head' | 'chest' | 'legs' | 'feet' | 'mainHand' | 'offHand' | 'ring' | 'neck'
+
+function createInventoryManager(options: InventoryOptions): InventoryManager
+
+function InventoryGrid(props: InventoryGridProps): JSX.Element
+function EquipmentSlots(props: EquipmentSlotsProps): JSX.Element
+function ItemMesh(props: ItemMeshProps): JSX.Element
+function LootTableDisplay(props: LootTableDisplayProps): JSX.Element
+
+function useInventory(): InventoryState & { manager: InventoryManager }
+```
+
+---
+
+## File layout
+
+```text
+gaming/gameplay/r3f-inventory/
+  package.json / tsconfig.json / vitest.config.ts
+  src/
+    index.ts / error-codes.ts
+    types/common.ts + md
+    state/inventory-manager.ts + md + test
+    hooks/use-inventory.ts + md + test
+    components/
+      InventoryGrid/ (tsx + md + test + stories + index)
+      EquipmentSlots/ (tsx + md + test + stories + index)
+      ItemMesh/ (tsx + md + test + stories + index)
+      LootTableDisplay/ (tsx + md + test + stories + index)
+  tests/integration.test.ts
+```

openspec/changes/enterprise-gaming-r3f-inventory/tasks.md

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+# Tasks: enterprise-gaming-r3f-inventory
+
+## 0. Pre-flight (non-negotiable)
+
+- [ ] 0.1 Confirm clean working tree (`git status` reports nothing) and no in-flight worktrees with uncommitted work (`git worktree list` then `git status` in each)
+- [ ] 0.2 If any worktrees exist under `.claude/worktrees/`, account for each one: still-active agent, work-pending-merge, or stale-and-prune. Stale worktrees MUST be removed (`git worktree remove`) before opening a new one — code that has been lost twice on main is the failure mode this guards against.
+- [ ] 0.3 Confirm the package set in `MANIFEST.md` matches `find packages -maxdepth 3 -name package.json` count. Drift here means a prior change archived without regenerating the manifest.
+
+## Phase 1 — Scaffold
+
+- [ ] Create `gaming/gameplay/r3f-inventory/` (`@suaveplan/r3f-inventory`, `0.1.0`, `sideEffects: false`)
+
+## Phase 2 — Types + error codes
+
+- [ ] `src/types/common.ts` + `common.md`
+- [ ] `src/error-codes.ts`
+
+## Phase 3 — InventoryManager + hook
+
+- [ ] `InventoryManager` — add/remove/move/split/equip/unequip, slot restriction rules
+- [ ] `useInventory` hook backed by useSyncExternalStore
+- [ ] Tests + docs
+
+## Phase 4 — Components
+
+- [ ] `InventoryGrid` — grid cells, drag-and-drop, stack splitting
+- [ ] `EquipmentSlots` — body-region anchors with slot restriction
+- [ ] `ItemMesh` — 3D model preview with fallback icon
+- [ ] `LootTableDisplay` — drop-chance bars
+- [ ] Tests + Storybook stories for each
+
+## Phase 5 — Integration tests
+
+- [ ] `tests/integration.test.ts` — equip flow, stack split, loot roll
+
+## Phase 6 — Pre-publish gate
+
+- [ ] `bunx turbo lint typecheck test --filter=@suaveplan/r3f-inventory` green
+- [ ] 100% coverage
+- [ ] Publish: `bun scripts/publish.ts --package @suaveplan/r3f-inventory`