Auto-Context: Semantische Kontext-Injektion, Memory-File-Embeddings, Agent-Toggle

- Automatische Embedding-basierte Kontext-Injektion vor jeder API-Anfrage
  (Top 5 Chat-Ergebnisse + Top 3 Memory-File-Treffer als recalled_context)
- Memory-Dateien (.md) werden embedded (Backfill + Live nach memory_write)
- Neue Agent-Option 'useAutoContext' (Checkbox, Default: aktiviert)
- VectorSearchService: SearchMemoryFilesAsync, EmbedMemoryFileAsync, Chunking
- EmbeddingBackgroundService: Memory-File-Backfill + EnqueueMemoryFile
- ToolService: memory_write löst Re-Embedding aus
- embeddingBg Parameter an ExecuteTool durchgereicht

Services/AnthropicService.cs

@@ -55,6 +55,7 @@ public class AnthropicService
         SubAgentContext finalizer = null,
         bool allowUserChoice = true,
         bool planMode = false,
+        bool useAutoContext = true,
         CancellationToken workCt = default,
         CancellationToken hardCt = default,
         CancellationToken sseCt = default,
@@ -76,6 +77,46 @@ public class AnthropicService
 
         try
         {
+            // ── Automatische Kontext-Injektion via Embedding-Suche ──
+            if (useAutoContext && _vectorSearch != null && systemPrompt != null && messages.Count > 0)
+            {
+                try
+                {
+                    // Letzte User-Message als Query extrahieren
+                    var lastUserText = ExtractLastUserText(messages);
+                    if (!string.IsNullOrWhiteSpace(lastUserText))
+                    {
+                        var contextResults = await _vectorSearch.SearchAsync(lastUserText, agentId, topN: 5, minScore: 0.45f);
+                        // Nur Ergebnisse aus anderen Sessions (nicht aktuelle Chain) und nicht zu kurze
+                        contextResults.RemoveAll(r => r.ChainId == chainId || (r.TextPreview?.Length ?? 0) < 20);
+                        // Memory-Dateien durchsuchen
+                        var memoryResults = await _vectorSearch.SearchMemoryFilesAsync(lastUserText, agentId, topN: 3, minScore: 0.45f);
+
+                        if (contextResults.Count > 0 || memoryResults.Count > 0)
+                        {
+                            var ctxSb = new StringBuilder();
+                            ctxSb.AppendLine("\n<recalled_context>");
+                            ctxSb.AppendLine("Die folgende Information wurde automatisch abgerufen und könnte relevant sein:");
+                            foreach (var r in contextResults)
+                            {
+                                var date = DateTime.TryParse(r.CreatedAt, out var dt) ? dt.ToString("yyyy-MM-dd HH:mm") : r.CreatedAt;
+                                ctxSb.AppendLine($"- [Gespräch, {r.Role}, {date}]: {r.TextPreview}");
+                            }
+                            foreach (var r in memoryResults)
+                            {
+                                ctxSb.AppendLine($"- [Memory, {r.FilePath}]: {r.TextPreview}");
+                            }
+                            ctxSb.AppendLine("</recalled_context>");
+                            systemPrompt.Add(new { type = "text", text = ctxSb.ToString() });
+                        }
+                    }
+                }
+                catch (Exception ex)
+                {
+                    Console.WriteLine($"[AutoContext] Error: {ex.Message}");
+                }
+            }
+
             while (iterations < maxIterations)
             {
                 // Hard-Stop: Sofortiger Abbruch aus while-Loop (Doppel-Klick Stop)
@@ -838,7 +879,7 @@ public class AnthropicService
 
                     string toolResult;
                     bool isError = false;
-                    try { toolResult = await _toolService.ExecuteTool(toolName, toolInput, agentWorkspace, _memoryService, agentId, workCt, vectorSearch: _vectorSearch); }
+                    try { toolResult = await _toolService.ExecuteTool(toolName, toolInput, agentWorkspace, _memoryService, agentId, workCt, vectorSearch: _vectorSearch, embeddingBg: _embeddingBg); }
                     catch (OperationCanceledException) { throw; }
                     catch (Exception ex) { toolResult = $"Fehler: {ex.Message}"; isError = true; }
 
@@ -1044,7 +1085,7 @@ public class AnthropicService
 
                         string toolResult;
                         bool isError = false;
-                        try { toolResult = await _toolService.ExecuteTool(toolName, toolInput, ctx.Workspace, _memoryService, ctx.AgentId, vectorSearch: _vectorSearch); }
+                        try { toolResult = await _toolService.ExecuteTool(toolName, toolInput, ctx.Workspace, _memoryService, ctx.AgentId, vectorSearch: _vectorSearch, embeddingBg: _embeddingBg); }
                         catch (OperationCanceledException) { throw; }
                         catch (Exception ex) { toolResult = $"Fehler: {ex.Message}"; isError = true; }
 
@@ -1345,7 +1386,7 @@ public class AnthropicService
 
                             string toolResult;
                             bool isError = false;
-                            try { toolResult = await _toolService.ExecuteTool(currentToolName, inputEl, workspace, _memoryService, agentId, workCt, remoteMgr: remoteMgr, sessionId: sessionId, vectorSearch: _vectorSearch); }
+                            try { toolResult = await _toolService.ExecuteTool(currentToolName, inputEl, workspace, _memoryService, agentId, workCt, remoteMgr: remoteMgr, sessionId: sessionId, vectorSearch: _vectorSearch, embeddingBg: _embeddingBg); }
                             catch (OperationCanceledException) { throw; }
                             catch (Exception ex) { toolResult = $"Fehler: {ex.Message}"; isError = true; }
 
@@ -1468,6 +1509,35 @@ public class AnthropicService
             : result;
     }
 
+    /// <summary>
+    /// Extrahiert den Text der letzten User-Message aus der Message-Liste.
+    /// </summary>
+    private static string ExtractLastUserText(List<object> messages)
+    {
+        for (int i = messages.Count - 1; i >= 0; i--)
+        {
+            var json = JsonSerializer.Serialize(messages[i]);
+            var el = JsonSerializer.Deserialize<JsonElement>(json);
+            if (!el.TryGetProperty("role", out var role) || role.GetString() != "user") continue;
+            if (!el.TryGetProperty("content", out var content)) continue;
+
+            if (content.ValueKind == JsonValueKind.String)
+                return content.GetString();
+
+            if (content.ValueKind == JsonValueKind.Array)
+            {
+                foreach (var block in content.EnumerateArray())
+                {
+                    var type = block.TryGetProperty("type", out var t) ? t.GetString() : "";
+                    if (type == "text" && block.TryGetProperty("text", out var txt))
+                        return txt.GetString();
+                }
+            }
+            break;
+        }
+        return null;
+    }
+
     /// <summary>
     /// Extrahiert Web-Search-Sources aus einem web_search_tool_result-Block.
     /// </summary>