feat(cluster): dial and pool yamux links to peer replicas

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Distinguishes a peer missing from the registry from a peer that will not
answer: the second must never be readable as node absence, or a network
hiccup between replicas evicts healthy workers.

The distinction is a property of the error type rather than of the call
sites. The unreachable error formats its cause into its message and keeps
it out of its unwrap chain, so an ErrInstanceNotFound picked up on the
dial path cannot reach a caller's absence check.

One yamux session is cached per peer and re-dialled when OpenStream on it
fails, which is how both a dead transport and a graceful remote go-away
arrive. A reset of one stream never reaches the pool, so an abandoned
request cannot cost every other worker its link.

Assisted-by: Claude Opus 5 [claude-code]
Signed-off-by: Ettore Di Giacinto <mudler@localai.io>

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