Juglipaff / fair-reward-distributor / 28733842250

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fix: preserve per-user stakeAge across re-stake within a window

_updateStake overwrote userInfo.stakeAge instead of accumulating, so a
sequence of stake -> withdraw -> stake within a single inter-distribution
window discarded stake-age from the prior sub-interval. Users repeating
this pattern received only the final window's share on distribute,
breaking the fairness invariant.

Rename _totalStakeAge to _distributionStakeAge to make the pool-level
accumulator's per-distribution reset semantic explicit and to
disambiguate from the per-user field. Add a test exercising the 3x1
proportional-share property across repeated stake/withdraw cycles.
Expand README to explain the prefix-sum mechanics driving O(1) settlement.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

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