Paul Lorenz d481224c9b Decompose multi-underlay channels onto the channel/v5 API. Fixes #3983 ...

- decomposes the ctrlchan, xlink and edge-listener channels onto the v5 Senders, MessageSourceProvider and UnderlayEventListener interfaces, replacing the v4 UnderlayHandler god-interface
- replaces the hand-rolled dial/grouping/backoff machinery with channel.BackoffDialPolicy and declarative Constraints; ctrl keeps survive-to-zero (Min: 0) with MinStableDuration: 0 for prompt reconnect, while xlink and edge default underlays keep Min: 1 so loss closes the channel
- builds grouped channels via channel.NewChannel(*Config) and moves handler retrieval to GetSenders()
- records the channel via InitChannel from each bind handler, before underlay events fire, so handlers registered during bind do not dereference a nil channel
- generates a group secret for ungrouped inbound ctrl underlays on the router accept path, matching the controller, since NewChannel requires one
- preserves link-id-as-channel-id (the link dial policy wraps the cloned link-id identity dialer) and adds a test asserting dialed underlays present the link id
- registers the latency handler explicitly, as it is no longer a self-describing receiver in v5

2026-06-18 12:51:02 -04:00

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controller.go

Decompose multi-underlay channels onto the channel/v5 API. Fixes #3983

2026-06-18 12:51:02 -04:00