⚡ Bolt: Optimize TokenBucketLimiter refill allocation

[google-labs-jules]

💡 What:
Replaced the AtomicInteger.updateAndGet call in the refill() method with a manual compareAndSet loop. Also added a check to prevent integer overflow when calculating tokens to add.

🎯 Why:
The original implementation used updateAndGet with a capturing lambda (current -> ...), which creates a new object instance every time the bucket is refilled. In high-throughput scenarios, this contributes to GC pressure. Additionally, calculating periodsElapsed * refillTokens could overflow long if the time difference is extremely large (e.g., system clock change), leading to incorrect token counts.

📊 Impact:

• Reduces object allocation in the refill hot path to zero.
• Ensures correctness even with extreme time gaps.

🔬 Measurement:
Run pnpm test (or ./gradlew test) to verify functionality remains unchanged. Performance impact can be measured with a microbenchmark on tryAcquire.

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PR created automatically by Jules for task 16865301977827477953 started by @SpaceLeam

[google-labs-jules]

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