v0.18.1

Changed

• Update the bundled mainnet feature set to match Solana mainnet-beta as of 2026-10-15 (#435).

Fixed

• Keep the sysvar cache unchanged when LiteSVM::set_account rejects invalid sysvar data. The rejected write used to drop that sysvar from the cache, so the next transaction panicked (#436).
• Return an error instead of panicking from litesvm_token::get_spl_account (and the *Checked token helpers that read the mint through it) when the account data is shorter than the requested state (#433).