Add --dry-run to process-redeemer command

[evgeny-stakewise]

Summary

Adds a --dry-run flag (env DRY_RUN) to the process-redeemer command.

When enabled:

• Every redeemOsTokenPositions call is simulated via .call() instead of being submitted as a transaction.
• On-chain state is left untouched between positions (no withdrawable-assets decrement, no endpoint-sync wait).
• processExitQueue is skipped entirely.

Notes

• Pure simulation per position against current chain state.
• Failures are logged with the exception instance (no traceback noise).