Fixed Semantic Search leaving out passages that did not fit into a search (#1167)

app/MindWork AI Studio/Tools/RAG/CharacterPage.cs

@@ -0,0 +1,14 @@
+namespace AIStudio.Tools.RAG;
+
+/// <summary>
+/// One page of results, cut by their length, see CharacterPaging.
+/// </summary>
+/// <param name="Start">The index of the first result on the page.</param>
+/// <param name="Count">How many results the page holds, at least one.</param>
+public readonly record struct CharacterPage(int Start, int Count)
+{
+    /// <summary>
+    /// The index right after the last result on the page, i.e., where the next page starts.
+    /// </summary>
+    public int End => this.Start + this.Count;
+}