normalize-policy phase-6: remove extra trimming in memory/sessions tool content paths

pkg/tools/memory_get.go

@@ -96,7 +96,7 @@ func (t *MemoryGetTool) Execute(ctx context.Context, args map[string]interface{}
 		return "", err
 	}
 
-	content := strings.TrimSpace(out.String())
+	content := out.String()
 	if content == "" {
 		return fmt.Sprintf("No content in range for %s (from=%d, lines=%d)", rawPath, from, lines), nil
 	}

pkg/tools/memory_write.go

@@ -65,9 +65,8 @@ func (t *MemoryWriteTool) Parameters() map[string]interface{} {
 
 func (t *MemoryWriteTool) Execute(ctx context.Context, args map[string]interface{}) (string, error) {
 	content, _ := args["content"].(string)
-	content = strings.TrimSpace(content)
 	if content == "" {
-		return "", fmt.Errorf("content is required")
+		return "error: content is required", nil
 	}
 
 	kind, _ := args["kind"].(string)

pkg/tools/sessions_tool.go

@@ -277,7 +277,7 @@ func (t *SessionsTool) Execute(ctx context.Context, args map[string]interface{})
 		var sb strings.Builder
 		sb.WriteString(fmt.Sprintf("History for %s:\n", key))
 		for _, item := range window {
-			content := strings.TrimSpace(item.msg.Content)
+			content := item.msg.Content
 			if len(content) > 180 {
 				content = content[:180] + "..."
 			}