fix: fix vector database and choose implementation version

src/Enums/EdgeDirection.cs

@@ -0,0 +1,36 @@
+namespace AiDotNet.Enums;
+
+/// <summary>
+/// Specifies the direction of edges to retrieve when querying a knowledge graph.
+/// </summary>
+/// <remarks>
+/// <para><b>For Beginners:</b> In a directed graph, edges have a direction - they go FROM one node TO another.
+///
+/// Think of it like Twitter follows:
+/// - If Alice follows Bob, the edge goes FROM Alice TO Bob
+/// - Alice has an OUTGOING edge (she's following someone)
+/// - Bob has an INCOMING edge (someone is following him)
+///
+/// When querying relationships:
+/// - Outgoing: "Who does this person follow?" (edges starting from this node)
+/// - Incoming: "Who follows this person?" (edges pointing to this node)
+/// - Both: "All connections" (both directions)
+/// </para>
+/// </remarks>
+public enum EdgeDirection
+{
+    /// <summary>
+    /// Retrieve only outgoing edges (edges where the specified node is the source).
+    /// </summary>
+    Outgoing,
+
+    /// <summary>
+    /// Retrieve only incoming edges (edges where the specified node is the target).
+    /// </summary>
+    Incoming,
+
+    /// <summary>
+    /// Retrieve both outgoing and incoming edges.
+    /// </summary>
+    Both
+}