justsisyphus 66f8946ff1 fix(background-agent): preserve parent model in notifyParentSession
Fixes model switching bug where sisyphus_task with category would
change the main session's model after completion.

- Add parentModel to session.prompt body in notifyParentSession
- Add test verifying model is included when parentModel is defined
2026-01-14 13:50:12 +09:00
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