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a6c5d23742
Add a new bus signal that lets reactive consumers (containerboot, kube agents, sniproxy, tsconsensus, etc.) react to self-node updates without having to subscribe to the full netmap. Today those consumers either watch Notify.NetMap (which on large tailnets is expensive to encode and ship per watcher) or poll. SelfChange is a cheap, narrow alternative: addresses, name, key expiry, capabilities, etc. Consumers that need additional state can react to SelfChange and then fetch the relevant bits on demand via existing LocalClient methods. Producer-side, every netmap-bearing setControlClientStatus call now also publishes SelfChange. Future changes will migrate individual in-tree consumers off Notify.NetMap to this signal, and eventually gate the legacy NetMap emission to platforms whose host GUIs still require it. Updates #12542 Change-Id: I4441650b0e085d663eb6bf26a03748b7d961ca49 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>