⚡ Bolt: Optimized TokenBucketLimiter refill logic

[google-labs-jules]

⚡ Bolt: Optimized TokenBucketLimiter refill logic

💡 What:

• Added a check to skip multiplication if periodsElapsed > capacity.
• Replaced AtomicInteger.updateAndGet with a manual compareAndSet loop.
• Ensured intermediate token addition uses long math.

🎯 Why:

• Performance: Avoids expensive 64-bit multiplication when unnecessary. Reduces object allocation (lambdas) in the hot path.
• Correctness: Prevents long overflow when calculating tokens for long time gaps (e.g. huge periods * refillTokens). Prevents int overflow when adding tokens to current bucket.

📊 Impact:

• Reduces allocation pressure during refill.
• Makes the limiter robust against time jumps or extremely high refill rates (e.g. Integer.MAX_VALUE per nanosecond).

🔬 Measurement:

• Verified with OptimizationVerificationTest using reflection to simulate large time gaps and high refill rates.
• Verified existing tests pass.

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PR created automatically by Jules for task 2319693898930156359 started by @SpaceLeam

[google-labs-jules]

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