Add blocking checkout with waiter queue#8

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jtdowney wants to merge 4 commits intoPevensie:mainfrom

jtdowney:blocking-checkout

Commits on Dec 23, 2025

Add blocking checkout with waiter queue
jtdowney
committed

Commits on Dec 28, 2025

Panic on timeout in apply_blocking to fix race condition
jtdowney
committed

Commits on Dec 29, 2025

Clarify pool size comments and add blocking strategy tests
jtdowney
committed

Commits on Jan 1, 2026

Move current_size calculations back into each branch
jtdowney
committed