fix(security): audit fixes across 9 custom pallets
- pez-rewards: checked arithmetic in parliamentary reward distribution
- tiki: saturating_add in get_tiki_score fold, benchmarking cleanup
- ping: saturating_add on PingCount
- staking-score: saturating_mul on 4 duration multipliers
- pez-treasury: proper error on TreasuryStartBlock None, saturating_add on NextReleaseMonth, doc fix 70->75%
- messaging: InboxOverflow event on FIFO eviction
- token-wrapper: reorder wrap/unwrap operations, add pallet balance pre-check
- welati: u64 cast for turnout percentage overflow prevention
- presale: fix refund calculation to use net_in_treasury (98%) instead of impossible 99%, update tests
pezkuwichain
896f94ca97