Every way a Lane pass can end now writes exactly one durable row: a skip
value naming the exit (paused, refusing, sidecar-down, no-fetcher,
due-query, asleep, eligible-count, nothing-eligible, or empty for the
loop), five outcome counts from the classification the Series read already
makes, and carry-forward of the previous pass's figures exactly when the
pass's own gap is zero. Refusal is durable through the poll_lanes row, so
a restart does not re-probe a Site inside its backoff. Retention is 14
days. The mid-loop browser-unreachable return writes an empty skip by
design: a tenth value is not invented here. (#141)
sulthan
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