Version 3 design tests

using System;using System.IO;using System.Linq;using System.Threading.Tasks;using Agent.Core.Memory;using Agent.Core.Ollama;using Xunit;​namespace Agent.Core.DesignTests;​public class MemorySystemTests{    private class MockOllamaClient : OllamaClient    {        public Func<string, float[]>? OnGetEmbedding { get; set; }​        public MockOllamaClient() : base(new Logging.Logger(_ => { }))        {        }​        public override Task<float[]> GetEmbeddingAsync(string prompt, string? modelOverride = null)        {            if (OnGetEmbedding != null)            {                return Task.FromResult(OnGetEmbedding(prompt));            }            return Task.FromResult(new float[] { 0.1f, 0.2f, 0.3f });        }    }​    [Fact]    public void CosineSimilarity_calculates_correct_value()    {        float[] vecA = { 1.0f, 0.0f, 0.0f };        float[] vecB = { 1.0f, 0.0f, 0.0f };        float[] vecC = { 0.0f, 1.0f, 0.0f };​        Assert.Equal(1.0f, MemoryManager.CosineSimilarity(vecA, vecB), 5);        Assert.Equal(0.0f, MemoryManager.CosineSimilarity(vecA, vecC), 5);    }​    [Fact]    public async Task MemoryManager_stores_and_loads_hierarchical_json()    {        string tempFile = Path.Combine(Path.GetTempPath(), "memory_test_" + Path.GetRandomFileName() + ".json");        var client = new MockOllamaClient();                // Setup deterministic mock embeddings based on text content to verify similarity        client.OnGetEmbedding = text =>        {            if (text.Contains("Alice")) return new float[] { 1.0f, 0.0f };            if (text.Contains("Bob")) return new float[] { 0.0f, 1.0f };            return new float[] { 0.5f, 0.5f };        };​        try        {            var manager = new MemoryManager(tempFile, client);​            // 1. Store dynamic branches and leaves            await manager.StoreAsync("user/name", "Alice");            await manager.StoreAsync("user/settings/theme", "dark");            await manager.StoreAsync("system/version", "6.0");​            // Verify file was written            Assert.True(File.Exists(tempFile));            string jsonContent = File.ReadAllText(tempFile);                        // Should contain hierarchy            Assert.Contains("\"user\"", jsonContent);            Assert.Contains("\"settings\"", jsonContent);            Assert.Contains("\"theme\"", jsonContent);            Assert.Contains("\"value\": \"Alice\"", jsonContent);​            // 2. Load it back into a new manager            var manager2 = new MemoryManager(tempFile, client);            Assert.Equal(3, manager2.Leaves.Count);​            // Verify paths and values are preserved            Assert.Equal("Alice", manager2.QueryPath("user/name"));            Assert.Equal("dark", manager2.QueryPath("user/settings/theme"));            Assert.Equal("6.0", manager2.QueryPath("system/version"));​            // 3. Test retrieve semantic search            // Query closest to Alice            var matchesAlice = await manager2.RetrieveAsync("Who is Alice?", topN: 1);            Assert.Single(matchesAlice);            Assert.Equal("user/name", matchesAlice[0].Path);            Assert.Equal("Alice", matchesAlice[0].Value);        }        finally        {            if (File.Exists(tempFile)) File.Delete(tempFile);        }    }}​