docs(service-registry): lock decisions (cascade delete, required key, SSH runner model)
- §11 decisions: cascade-delete services with widgets; MANAGE_ENCRYPTION_KEY
always required; SSH task runner is multi-instance with reusable tasks.
- §12 SSH task runner model: instances absorb SSH task transport, tasks stay
global/reusable with default_service_id, service_task_runs logs history,
widget config { task_id, service_id? }.
- tasks.md: add service_task_runs table + cascade-delete tests to Slice 1,
SSH run-logging to Slice 2, follow-ups (Actions rebuild, machine unification).
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