Allow Remote sessions to outlive connection forms

sdk/python/cthulhu_tentacle/__init__.py

@@ -13,6 +13,14 @@ The continuation receives "remote" metadata after explicit local approval, or
 "cancelled": True on denial. Match approval to the actual SessionClient event;
 neither a request dictionary nor submitted metadata is itself consent. This
 interaction addition requires the matching updated reader.
+
+After remote.open, an explicit return-to-desktop action can finish with
+{"remote_background": {"lease": lease["lease"], "epoch": lease["epoch"]},
+ "done": True}. The host checks an already-open lease belonging to this process;
+this neither grants consent nor renews it. Keep heartbeating and provide an
+explicit status/disconnect command. Other interaction effects cannot accompany
+this terminal result, except ordinary speech/Braille presentation. Cancellation
+and normal form closure still end setup. Older hosts reject this addition.
 """
 
 import json