Restart daemon tasks on failure

[leynos]

Summary

• Supervise listener and worker tasks and restart them on failure to keep daemon alive
• Document supervision strategy in architecture design

Testing

• make fmt
• make lint
• make test
• make markdownlint

closes #7

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https://chatgpt.com/codex/tasks/task_e_68a4a757786c832288519a94b9511adf

Summary by Sourcery

Implement supervision of listener and worker tasks to automatically restart them on failure

New Features:

• Supervise and restart listener and worker daemon tasks upon unexpected exit

Documentation:

• Document the task supervision strategy in the architecture design

Tests:

• Add tests to verify supervisor restarts failed listener and worker tasks