Ship Assistent 0.10: settings panel and UserPrefs with prompt weight.

Separate About-the-user memory (global + per-persona) from craft RAG, add tabbed settings with persona export/import and craft clear APIs.

Co-authored-by: Cursor <cursoragent@cursor.com>

AssistentMemory.cs

@@ -138,6 +138,14 @@ public sealed partial class AssistentMemory : IDisposable
         {
             Logs.Debug($"AssistentMemory store schema: {ex.Message}");
         }
+        try
+        {
+            EnsureUserPrefsSchema();
+        }
+        catch (Exception ex)
+        {
+            Logs.Debug($"AssistentMemory user_prefs schema: {ex.Message}");
+        }
         _embedModel = GetMeta("embed_model") ?? _embedModel;
         _ = int.TryParse(GetMeta("dims"), out _dims);
         _ = int.TryParse(GetMeta("seed_version"), out _seedVersion);