Update README: Mark Phase 3 wgpu-hal bridge as in progress

Phase 3: WebGPU Integration & Bevy Completion now shows 15% complete

Updated wgpu-hal bridge status from ⚪ to 🔄:
- Format/usage conversion layer ✅
- WgpuTextureHandle wrapper ✅
- wgpu-types integration ✅
- External memory import ⏳ (pending)

Current Phase 3 progress:
✅ wgpu-hal foundation (src/bevy_plugin/wgpu_bridge.rs)
⏳ External memory import
⏳ Bevy multi-window example
⏳ Bevy multi-process game
⏳ WebGPU backend
⏳ Cross-API sharing
⏳ Web platform support

Author: vdmokstati

README.md

@@ -134,8 +134,8 @@ The modern graphics landscape often involves multiple applications or components
 *   🔄 **Bevy engine integration** - Plugin foundation complete (wgpu-hal bridge remains for Phase 3)
 *   ⚪ **Vulkan ↔ Metal sharing** - Requires macOS development environment
 
-### 🔵 Phase 3: WebGPU Integration & Bevy Completion (Future)
-*   ⚪ **wgpu-hal bridge** - Complete Bevy zero-copy integration
+### 🔵 Phase 3: WebGPU Integration & Bevy Completion (15% Complete)
+*   🔄 **wgpu-hal bridge** - Foundation complete (format/usage conversion, handle wrappers), external memory import pending
 *   ⚪ **Bevy multi-window example** - Shared textures across windows
 *   ⚪ **Bevy multi-process game** - Physics/render process separation
 *   ⚪ **WebGPU backend** - Import/export for wgpu