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# Shader Code Reuse Investigation
-## Current State
+## ✅ Implementation Status
+
+**Date:** February 13, 2026
+**Solution:** Option 1 - Shared Common Directory
+**Status:** IMPLEMENTED
+
+**Results:**
+- Created `common/shaders/` with 20 shared shader files
+- Eliminated 36 duplicate files across workspaces
+- Asset references use `../../common/shaders/...`
+- Enhanced asset_packer with filesystem path normalization
+- Build passes, all tests pass
+
+See `doc/FILE_HIERARCHY_CLEANUP_2026-02-13.md` for full details.
+
+---
+
+## Investigation (Historical)
+
+### Current State
### Duplication Analysis
- **36 duplicate shader files** between main and test workspaces