Background task sessions registered in subagentSessions were not receiving
todo-continuation prompts, causing a deadlock: background tasks waited for
continuation that never came.
Changes:
- Allow both main session and background task sessions to receive continuation
- Add test for background task session continuation behavior
- Cleanup subagentSessions in test setup/teardown
This fixes the deadlock introduced in commit 116a90d which added todo waiting
logic to background-agent/manager.ts.
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