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

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+# OpenSpec Change: enterprise-gaming-r3f-building
+
+- **Change ID**: enterprise-gaming-r3f-building
+- **Package**: `@suaveplan/r3f-building`
+- **Category**: gaming/scene
+- **Target path**: `gaming/scene/r3f-building`
+- **Status**: PROPOSED
+- **Date**: 2026-04-24
+- **Reference spec**: `/mnt/s/web/suaveplan/enterprise/r3f-building.md`
+
+---
+
+## Summary
+
+Deliver `@suaveplan/r3f-building` on the genesis branch from scratch at enterprise quality. The package provides R3F building mode UI: ghost preview of the piece being placed, snap socket highlight spheres, invalid placement red tint, confirm/cancel keybind integration, and structural instability shake effect. It wires directly to `@suaveplan/building`'s `PlacementEngine` and `StructureGraph`. A `BuildingMode` component activates the placement mode context; `PlacementGhost` renders the translucent preview mesh. Genesis adds structured errors, OTel placement counter, and 100% coverage.
+
+---
+
+## Available workspace deps
+
+`@suaveplan/error`, `@suaveplan/building`, `@suaveplan/controller`, react, `@react-three/fiber`, `@react-three/drei`, three.
+
+---
+
+## Public API surface
+
+```ts
+function BuildingMode(props: BuildingModeProps): JSX.Element
+// registry, onPlaced, onCancel, controllerManager
+
+function PlacementGhost(props: PlacementGhostProps): JSX.Element
+function SnapIndicator(props: SnapIndicatorProps): JSX.Element
+function PlacedPieces(props: PlacedPiecesProps): JSX.Element
+
+function useBuildingMode(): BuildingModeCon```text
+
+---
+
+## File layout
+
+```text
+gaming/scene/r3f-building/
+  package.json / tsconfig.json / vitest.config.ts
+  src/
+    index.ts / error-codes.ts
+    types/common.ts + md
+    context/building-mode-provider.tsx + md + test
+    hooks/use-building-mode.ts + md + test
+    components/
+      BuildingMode/ (tsx + md + test + stories + index)
+      PlacementGhost/ (tsx + md + test + stories + index)
+      SnapIndicator/ (tsx + md + test + stories + index)
+      PlacedPieces/ (tsx + md + test + stories + index)
+  tests/integration.test.ts
+```