Native Renderkern: Rust/GStreamer-Plugin nach ADR-0004 (996 Zeilen)

- Cargo.toml: gstreamer-rs 0.22, windows-rs 0.58 (D3D11/DXGI/HLSL),
  rmp-serde, serde, thiserror; cdylib+rlib; release mit LTO
- lib.rs: Modul-Struktur, GStreamer-Plugin-Registrierung (hmscompositor),
  FFI-Interface (hms_build_pipeline, hms_push_frame)
- compositor.rs: alle 9 Blend-Modi (§12.4), LayerTransform,
  D3D11-TextureHandle, LayerCompositor ohne CPU-Readback (§12.6)
- shader_loader.rs: HmsParams-cbuffer nach §14.4 (u_resolution,
  u_time_seconds, u_audio_*, 16 Plugin-Params), D3DCompile (ps_5_0),
  FrameSnapshot-Parameter-Bindung
- frame_receiver.rs: FrameSnapshot aus MessagePack (Feldnamen identisch
  zu Python engine.py), Thread-sicher
- pipeline_builder.rs: d3d11h264dec -> d3d11convert -> hmscompositor ->
  d3d11videosink (§13.1)
- README.md: Windows-Build-Anleitung, Python-Integration (ctypes)
- Nicht kompiliert (ADR-0008: kein cargo im Container); zwei
  Pruefpunkte fuer Windows-Durchlauf dokumentiert:
  SimpleElement-Subklasse, D3DCompile-Signatur

native/render_bridge/Cargo.toml

@@ -0,0 +1,52 @@
+[package]
+name = "hms_render_bridge"
+version = "0.1.0"
+edition = "2021"
+description = "HMS MediaEngine native render bridge (ADR-0004): GStreamer D3D11 pipeline, layer compositor, HLSL shader loader."
+license = "MIT"
+
+[lib]
+name = "hms_render_bridge"
+crate-type = ["cdylib", "rlib"]
+
+[dependencies]
+# GStreamer core + video + base (gstreamer-rs)
+gstreamer = "0.22"
+gstreamer-video = "0.22"
+gstreamer-base = "0.22"
+gstreamer-gl = "0.22"
+
+# D3D11 interop via windows-rs (Windows only)
+[target.'cfg(windows)'.dependencies]
+windows = { version = "0.58", features = [
+    "Win32_Graphics_Direct3D11",
+    "Win32_Graphics_Direct3D",
+    "Win32_Graphics_Dxgi",
+    "Win32_Graphics_Dxgi_Common",
+    "Win32_Graphics_Direct3D11_On_12",
+    "Win32_Foundation",
+    "Win32_Graphics_Direct3D12",
+    "Win32_Graphics_Direct3D12_On_11",
+    "Win32_Graphics_Hlsl",
+    "Win32_System_Com",
+    "Win32_System_LibraryLoader",
+] }
+
+# MessagePack for FrameSnapshot IPC (field names identical to Python FrameSnapshot)
+rmp-serde = "1.3"
+serde = { version = "1.0", features = ["derive"] }
+serde_json = "1.0"
+serde_bytes = "0.11"
+
+# Logging
+log = "0.4"
+env_logger = "0.11"
+
+# Error handling
+thiserror = "1.0"
+
+[profile.release]
+opt-level = 3
+lto = true
+codegen-units = 1
+panic = "abort"