feat: NMv3: mixnode liveness sending

[jstuczyn]

What it does

• Per-kind probe profile. The liveness profile is 50 packets per target at 50 packets/second (a one second send window), with a 5 second straggler wait and a 30 second per-target deadline, all CLI- and env-overridable. The kind is the only input: profile_for(kind) derives the profile, so the two cannot be set to disagree.
• Shared mixnet ingress. One listener serves a whole wave. Each accepted connection is resolved to its target through a canonicalised source-keyed table before the handshake, then upgraded and read by a handler of its own, so one slow peer cannot delay the rest. Attribution is structural: a connectionresolves once, and its handler delivers only to that target's inbox.
• Wave executor. MixnetWave probes every target concurrently under the per-target deadline, so a wave's duration is the slowest single target rather than the sum. Each result is submitted the moment that target finishes, releasing its in-flight lock independently.
• Failure isolation. A node-level failure is submitted even when zeroed, because submission is what advances staleness. A critical agent-side failure submits nothing and lets the lease expire, so the node keeps its turn.
• Stress runs through the same path as a wave of one, so both kinds share one implementation rather than drifting.

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