Paul Lorenz 6326203b5d Add controller Limbo state, takeover splice, and reroute token issuance ...

- adds circuit reroute state (active/Limbo) with a grace timer, entered on
  an ingress ChannelClosed fault for a reroutable circuit and torn down on
  grace expiry; issues a controller-signed reroute token at circuit
  creation when reroutable
- adds the takeover splice (X1): re-splices a reroutable circuit's ingress
  to a new router under the circuit's mutation guard, preserving the
  terminator side, advancing the iteration, and minting a fresh token
- stamps the fault reason on router-emitted ingress faults so only a
  channel close is Limbo-eligible
- keeps the D3 idle scanner from prematurely reaping Limbo circuits

2026-07-31 10:13:08 -04:00

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Add controller Limbo state, takeover splice, and reroute token issuance

2026-07-31 10:13:08 -04:00