feat: route actor failures through per-source supervision strategies#78
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Signed-off-by: Joshua Temple <joshua.temple@stablekernel.com>
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Layers a supervision policy over the kernel's raw escalation seam. A
Supervisorroutes each escalated child-actor failure to aDecisionby the src the actor was spawned from, with a configurable default:Escalateforwards the failure to a configured sink (the next handler up the hierarchy), andStopcontains it at this level. It exposes aHandlemethod that plugs straight intoActorSystem.WithEscalationHandler, and records every failure it processed (Handled()) for observability. This turns the typedActorEscalationinto per-source supervision strategy, and is the foundation the restart and backoff strategies build on next. Coverage: cluster 100 percent. Additive; stdlib-only.