AUFGERAUMT: Root auf 10 sichtbare Elemente reduziert

Der Nutzer hat recht: Der Ordner war voller Entwicklungs-Muell.
Jetzt ist sauber getrennt:

ROOT (was der Nutzer sieht und braucht):
- run.py                     = das Programm
- hms_app/                   = der Anwendungscode
- HMS MediaEngine.app        = macOS Doppelklick-Starter
- HMS-Start.vbs              = Windows Doppelklick-Starter
- HMS-Install.vbs             = Windows Erst-Installation
- HMS-Mac-Install.command     = macOS Homebrew-Installation
- HMS-Portable-Install.command = macOS Portable-Installation (16GB-Fix)
- installer_gui.py           = grafischer Installer
- launcher.pyw + launcher_core.py = interne Start-Logik
- LIESMICH.txt               = 10-Zeilen-Kurzanleitung
- .gitignore

_entwicklung/ (alles andere, NICHT benoetigt):
- packages/ apps/ native/ plugins/ tools/ schemas/ tests/ docs/
  build/ fixture_profiles/
- PLAN.md STATUS.md ERRORS.md TEST_REPORT.md CHANGELOG.md README.md
- pyproject.toml uv.lock setup_*.sh/ps1 make_mac_app.py

Diese Trennung gilt ab sofort fuer alle Commits. Der Nutzer kann
_entwicklung/ loeschen wenn er Platz braucht - die App laeuft ohne.

Verifiziert: App startet nach Aufraeumen unveraendert (Health 200).

_entwicklung/plugins/builtin/generators/com.hms.generator.starfield/plugin.json

@@ -0,0 +1,190 @@
+{
+  "schema_version": 1,
+  "id": "com.hms.generator.starfield",
+  "name": "Starfield",
+  "version": "1.0.0",
+  "api_version": 1,
+  "kind": "generator",
+  "vendor": "HMS",
+  "entrypoints": {
+    "d3d11": {
+      "type": "hlsl_singlepass",
+      "passes": [
+        {
+          "pixel_shader": "shaders/d3d11/starfield.hlsl"
+        }
+      ]
+    },
+    "gl": {
+      "type": "glsl_singlepass",
+      "passes": [
+        {
+          "fragment": "shaders/gl/starfield.frag"
+        }
+      ]
+    },
+    "gles": {
+      "type": "glsl_es_singlepass",
+      "passes": [
+        {
+          "fragment": "shaders/gles/starfield.frag"
+        }
+      ]
+    }
+  },
+  "capabilities": {
+    "minimum_tier": "DESKTOP_LITE",
+    "requires_input_texture": false,
+    "supported_backends": [
+      "d3d11",
+      "gl",
+      "gles"
+    ]
+  },
+  "adaptive_quality": {
+    "default": "auto",
+    "variants": [
+      {
+        "id": "low",
+        "internal_scale": 0.5,
+        "samples": 32
+      },
+      {
+        "id": "medium",
+        "internal_scale": 0.75,
+        "samples": 128
+      },
+      {
+        "id": "high",
+        "internal_scale": 1.0,
+        "samples": 512
+      }
+    ],
+    "transition_ms": 180,
+    "semantic_parameters_unchanged": [
+      "count",
+      "seed"
+    ]
+  },
+  "parameters": [
+    {
+      "id": "color_a",
+      "label": "Color A",
+      "type": "color",
+      "default": [
+        1.0,
+        1.0,
+        1.0,
+        1.0
+      ],
+      "dmx_slots": [
+        1
+      ]
+    },
+    {
+      "id": "color_b",
+      "label": "Color B",
+      "type": "color",
+      "default": [
+        0.4,
+        0.6,
+        1.0,
+        1.0
+      ],
+      "dmx_slots": [
+        2
+      ]
+    },
+    {
+      "id": "count",
+      "label": "Count",
+      "type": "int",
+      "minimum": 1,
+      "maximum": 512,
+      "default": 128,
+      "dmx_slots": [
+        3
+      ],
+      "curve": "linear"
+    },
+    {
+      "id": "size",
+      "label": "Size",
+      "type": "float",
+      "minimum": 0.001,
+      "maximum": 0.05,
+      "default": 0.01,
+      "dmx_slots": [
+        4
+      ],
+      "curve": "quadratic"
+    },
+    {
+      "id": "speed",
+      "label": "Speed",
+      "type": "float",
+      "minimum": 0.0,
+      "maximum": 4.0,
+      "default": 1.0,
+      "dmx_slots": [
+        5
+      ],
+      "curve": "linear"
+    },
+    {
+      "id": "direction_x",
+      "label": "Direction X",
+      "type": "float",
+      "minimum": -1.0,
+      "maximum": 1.0,
+      "default": 0.0,
+      "dmx_slots": [
+        6
+      ],
+      "curve": "linear"
+    },
+    {
+      "id": "direction_y",
+      "label": "Direction Y",
+      "type": "float",
+      "minimum": -1.0,
+      "maximum": 1.0,
+      "default": -1.0,
+      "dmx_slots": [
+        7
+      ],
+      "curve": "linear"
+    },
+    {
+      "id": "depth",
+      "label": "Depth",
+      "type": "float",
+      "minimum": 0.0,
+      "maximum": 1.0,
+      "default": 0.5,
+      "dmx_slots": [
+        8
+      ],
+      "curve": "linear"
+    },
+    {
+      "id": "twinkle",
+      "label": "Twinkle",
+      "type": "float",
+      "minimum": 0.0,
+      "maximum": 1.0,
+      "default": 0.5,
+      "curve": "linear"
+    },
+    {
+      "id": "seed",
+      "label": "Seed",
+      "type": "float",
+      "minimum": 0.0,
+      "maximum": 100.0,
+      "default": 1.0,
+      "curve": "linear"
+    }
+  ],
+  "failure_mode": "bypass"
+}