Support Assistent persona packs via git and local sync.

Replace assistent-personas overlay seed with assistent-extensions SFTP and an assistent: section in extensions.yaml so personalities install like other extensions without private URLs in the public repo.

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

.gitignore

@@ -8,6 +8,8 @@ models.yaml
 assistent-personas.yaml
 assistent-personas/
 !assistent-personas.example/
+assistent-extensions/
+!assistent-extensions.example/
 extensions.yaml
 
 # SwarmUI checkpoints / LoRA dropped into the app tree