ben-manes / caffeine / #5360

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Document TimerWheel zero-boundary edge case in advance()

When nanoTime transitions from -1 to exactly 0, the wrap-around
compensation condition (prev < 0 and curr > 0) misses because
0 > 0 is false. This causes a 1-tick delay that self-corrects on
the next advance. The delay is within Pacer TOLERANCE and the
window is 1ns wide, making it astronomically unlikely to hit.

Added test codifying the behavior and comment explaining the edge case.

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