add guest star invite contract

contracts/v1/guest-star-invites-response.json

@@ -0,0 +1,18 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "$id": "https://trixie.local/contracts/v1/guest-star-invites-response.json",
+  "title": "Guest Star invites response",
+  "type": "array",
+  "items": {
+    "type": "object",
+    "additionalProperties": false,
+    "required": ["user_id", "invited_at", "status", "is_video_enabled", "is_audio_enabled"],
+    "properties": {
+      "user_id": { "type": "string", "minLength": 1 },
+      "invited_at": { "type": "string", "format": "date-time" },
+      "status": { "type": "string", "enum": ["INVITED", "ACCEPTED", "READY"] },
+      "is_video_enabled": { "type": "boolean" },
+      "is_audio_enabled": { "type": "boolean" }
+    }
+  }
+}

fixtures/v1/guest-star-invites.response.json

@@ -0,0 +1,9 @@
+[
+  {
+    "user_id": "144601104",
+    "invited_at": "2026-10-25T12:00:00Z",
+    "status": "READY",
+    "is_video_enabled": true,
+    "is_audio_enabled": false
+  }
+]