fix: prevent connection storm during outage recovery - #7
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Counts pending dial attempts toward MaxConns so a burst of blocked Acquire() calls waking up after an outage cannot each start its own dial — protecting PostgreSQL max_connections. Pending counter decrements on every failure path (dial timeout, ctx cancellation, auth failure) to avoid pool starvation, and a new conn is registered before capacity is released to avoid an undershoot window. Closes #3.