Fix concurrent S3 credential refresh and preloaded split stalls - #32

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HighPerfDataAccelerator:devfrom

winningsix:fix/s3-credential-ready-splits-20260730

Commits on Jul 30, 2026

perf(exec): schedule preloaded splits in ready order
winningsix
committed
1a46192
fix(s3): serialize default credential refresh
winningsix
committed
0151f9d