Fixes#191
This commit ensures that the user's selected model is preserved when
background tasks complete and notify their parent sessions.
Changes:
- Add parentModel field to BackgroundTask and LaunchInput interfaces
- Capture model context when launching background tasks
- Pass model context when notifying parent sessions after task completion
Impact:
- Users with OAuth providers (Google, Anthropic) will now have their
model selection preserved across background task continuations
- Background agents no longer revert to hardcoded defaults
Co-authored-by: sisyphus-dev-ai <sisyphus-dev-ai@users.noreply.github.com>
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