feat: add <kindred> element to package.xml

Declares min_create_version=0.1.0, load_priority=50, pure_python=true,
and documents partdesign.body/feature context injection.

CatppuccinMocha/CatppuccinMocha.cfg

@@ -27,13 +27,13 @@
           <FCUInt Name="colorError" Value="4086016255"/>
         </FCParamGroup>
         <FCParamGroup Name="View">
-          <FCUInt Name="BackgroundColor" Value="505294591"/>
-          <FCUInt Name="BackgroundColor2" Value="286333951"/>
-          <FCUInt Name="BackgroundColor3" Value="404235775"/>
-          <FCUInt Name="BackgroundColor4" Value="825378047"/>
+          <FCUInt Name="BackgroundColor" Value="404235775"/>
+          <FCUInt Name="BackgroundColor2" Value="1819313919"/>
+          <FCUInt Name="BackgroundColor3" Value="1819313919"/>
+          <FCUInt Name="BackgroundColor4" Value="404235775"/>
           <FCBool Name="Simple" Value="0"/>
           <FCBool Name="Gradient" Value="1"/>
-          <FCBool Name="UseBackgroundColorMid" Value="0"/>
+          <FCBool Name="UseBackgroundColorMid" Value="1"/>
           <FCUInt Name="HighlightColor" Value="3416717311"/>
           <FCUInt Name="SelectionColor" Value="3032415999"/>
           <FCUInt Name="PreselectColor" Value="2497893887"/>

package.xml

@@ -29,4 +29,15 @@
     </preferencepack>
   </content>
 
+  <!-- Kindred Create extensions -->
+  <kindred>
+    <min_create_version>0.1.0</min_create_version>
+    <load_priority>50</load_priority>
+    <pure_python>true</pure_python>
+    <contexts>
+      <context id="partdesign.body" action="inject"/>
+      <context id="partdesign.feature" action="inject"/>
+    </contexts>
+  </kindred>
+
 </package>