Add Reentrancy Guard to Core Consumer Functions#356
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This pr closes #257
Implemented a transient boolean lock (DataKey::IsLocked) and added a strict check at the entry point of every core consumer routing function. Calls now panic with Error::ReentrancyDetected when the lock is active, preventing re‑entrant execution during oracle calculations. Updated documentation comments accordingly. The new
reentrancy-guardbranch is pushed and ready for a pull request.