Phase 0: Repository-Initialisierung nach Bauplan v1.2

- Struktur gemäß §8 (Eigentumsgrenzen), PLAN.md als normative Basis
- Pflichtdokumente: STATUS.md, ERRORS.md, TEST_REPORT.md, CHANGELOG.md, ADRs
- ADR-0001 Python 3.13-Pin, ADR-0002 GStreamer 1.28.6-Pin (Windows),
  ADR-0003 IPC TCP+MessagePack v1
- Kernpakete: hms_protocol, hms_domain, hms_parameter, hms_artnet,
  hms_adaptive, hms_capabilities, hms_plugin_sdk
- Renderer-Spike: D3D11-Primärpfad + Dev-GL-Pfad (§36 Nr. 4-5)
- Control Core: FastAPI REST + WebSocket (§36 Nr. 9)
- Beispielplugins: Passthrough + Gaussian Blur (3 Adaptive-Quality-
  Varianten, HLSL/GLSL/GLES)
- Tools: Art-Net-Emulator, Fixture-Generator (Master32/Layer64-CSV),
  Capability-Probe
- JSON-Schemas: IPC, Plugin, Projekt, Cluster
- 121 Unit-/Integrationstests grün, Ruff grün

Gate 0 bleibt offen: Hardwaremessungen nur auf echter Windows-Referenz-
hardware gültig (§29.7, §33).

plugins/examples/com.hms.fx.example_passthrough/shaders/gl/passthrough.frag

@@ -0,0 +1,33 @@
+#version 330 core
+// HMS MediaEngine – Beispielplugin: Passthrough mit Live-Parameter "mix"
+// GLSL-Testvariante, semantisch identisch zur HLSL-Implementierung (§36 Nr. 6).
+// Standard-Inputs gemäß PLAN.md §14.4; Bindung über den GL-Backend-Adapter.
+
+uniform sampler2D u_input_texture;
+uniform vec2  u_resolution;
+uniform float u_time_seconds;
+uniform float u_delta_seconds;
+uniform float u_frame_index;
+uniform float u_layer_opacity;
+uniform float u_audio_rms;
+uniform float u_audio_peak;
+uniform float u_audio_bass;
+uniform float u_audio_mid;
+uniform float u_audio_treble;
+uniform float u_audio_beat;
+uniform float param_mix;
+
+in  vec2 v_uv;
+out vec4 fragColor;
+
+void main()
+{
+    vec4 src = texture(u_input_texture, v_uv);
+
+    float pulse = 0.5 + 0.5 * sin(u_time_seconds * 2.0);
+    float m     = clamp(param_mix, 0.0, 1.0);
+    vec3  rgb   = src.rgb * mix(1.0, pulse, m);
+    float a     = src.a * u_layer_opacity;
+
+    fragColor = vec4(rgb * u_layer_opacity, a);
+}