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

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+# OpenSpec Change: enterprise-gaming-r3f-lod
+
+- **Change ID**: enterprise-gaming-r3f-lod
+- **Package**: `@suaveplan/r3f-lod`
+- **Category**: gaming/effects
+- **Target path**: `gaming/effects/r3f-lod`
+- **Status**: PROPOSED
+- **Date**: 2026-04-24
+
+---
+
+## Summary
+
+Deliver `@suaveplan/r3f-lod` on the genesis branch from scratch at enterprise quality. The package provides level-of-detail management for React Three Fiber. An `LodGroup` component accepts child meshes paired with distance thresholds; the `LodManager` evaluates camera distance each frame and swaps the active mesh; a `BillboardLod` fallback renders a sprite at maximum distance. Supports hysteresis bands to prevent LOD flickering. Genesis adds structured errors, OTel active-lod-level histogram, and 100% coverage.
+
+---
+
+## Available workspace deps
+
+`@suaveplan/error`, react, `@react-three/fiber`, `@react-three/drei`, three.
+
+---
+
+## Public API surface
+
+```ts
+function LodGroup(props: LodGroupProps): JSX.Element
+// levels: { distance: number; children: ReactNode }[]
+// hysteresis?: number
+
+function BillboardLod(props: BillboardLodProps): JSX.Element
+// atlasTexture, frameIndex, sizeAttenuation
+
+function useLod(ref: RefObject<Object3D>): number   // current LOD level
+```
+
+---
+
+## File layout
+
+```text
+gaming/effects/r3f-lod/
+  package.json / tsconfig.json / vitest.config.ts
+  src/
+    index.ts / error-codes.ts
+    types/common.ts + md
+    core/lod-manager/ (ts + md + types + test + index)
+    components/
+      LodGroup/ (tsx + md + test + stories + index)
+      BillboardLod/ (tsx + md + test + stories + index)
+    hooks/use-lod.ts + md + test
+  tests/integration.test.ts
+```

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

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+# Tasks: enterprise-gaming-r3f-lod
+
+## 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 + types
+
+## Phase 2 — LOD manager
+
+- [ ] Distance evaluation, hysteresis band, level selection
+- [ ] Tests + docs
+
+## Phase 3 — Components + stories
+
+- [ ] `LodGroup`, `BillboardLod`
+
+## Phase 4 — `useLod` hook
+
+## Phase 5 — Pre-publish gate
+
+- [ ] `bunx turbo lint typecheck test --filter=@suaveplan/r3f-lod` green
+- [ ] 100% coverage
+- [ ] Publish: `bun scripts/publish.ts --package @suaveplan/r3f-lod`