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).

schemas/ipc/envelope_v1.schema.json

@@ -0,0 +1,18 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "$id": "hms/schemas/ipc/envelope_v1.schema.json",
+  "title": "HMS IPC Envelope v1",
+  "description": "PLAN.md §6.2: Jede IPC-Nachricht besitzt mindestens diese Felder.",
+  "type": "object",
+  "required": ["protocol_version", "message_id", "type", "revision", "monotonic_timestamp_ns", "payload"],
+  "properties": {
+    "protocol_version": {"const": 1},
+    "message_id": {"type": "string", "format": "uuid"},
+    "type": {"enum": ["command", "event", "snapshot", "ack", "error", "telemetry"]},
+    "revision": {"type": "integer", "minimum": 0},
+    "monotonic_timestamp_ns": {"type": "integer", "minimum": 0},
+    "payload": {"type": "object"},
+    "idempotency_key": {"type": "string"}
+  },
+  "additionalProperties": false
+}