fix(rewards): guard BeginBlocker against clock regression

[amathxbt]

Summary

Bug: BeginBlocker had no guard for the case where ctx.BlockTime() <= schedule.LastReleaseTime. The only time check was if schedule.LastReleaseTime.IsZero(). If block time did not advance (clock skew, replay, same-millisecond blocks in testing), CalculateReward was called with a non-positive elapsed duration, producing a zero or — absent the companion reward.go guard — a negative coin amount that panicked sdk.NewCoin.

Fix: Return nil early when !ctx.BlockTime().After(schedule.LastReleaseTime), logging the anomaly at ERROR for operator visibility.

Files changed

• x/rewards/keeper/abci.go

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Reviewing files that changed from the base of the PR and between e0d3113 and 5d6f7d6.

📒 Files selected for processing (1)

• x/rewards/keeper/abci.go

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[codecov]

Codecov Report

❌ Patch coverage is 0% with 7 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
x/rewards/keeper/abci.go	0.00%	7 Missing ⚠️

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