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>

assistent-extensions.example/README.md

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+# Assistent persona packs (laptop → VM)
+
+Clone git persona packs into this folder (one subdirectory per pack).
+
+On `gpu-rent up` / `seed-personas` / `push` each pack is SFTP'd to
+`/mnt/swarm_data/Assistent/extensions/<dirname>/` (``.git`` is not uploaded).
+
+Pack layout (repo root):
+
+```
+assistent-pack.yaml   # kind: persona  /  id: my_persona
+persona.json
+voice.json
+…
+```
+
+Or multi-pack: `personas/<id>/persona.json` under the clone.
+
+Bundled personas ship with swarm-assistent (`neutral`, `aggressive`, `dreamer`).
+Private packs stay only here — do not put their URLs in `extensions.yaml` if you
+do not want them captured/shared.
+
+Overlay clones created in the Assistent UI are **not** deleted by seed.