Syscall argument error is silently ignored

**Description**
This alignment is a fair assumption, and probably required for C ABI compliance. But as far as defensive programming goes, it is better to fail if the address is misaligned than to silently align it.

**Recommendation**
Fail if the pointer is misaligned.

[packages/contracts-bedrock/src/cannon/MIPS64.sol](https://cantina.xyz/code/4ea41142-4359-4f62-bfaa-a542172cab5d/packages/contracts-bedrock/src/cannon/MIPS64.sol#L584)
uint64 effAddr = a1 & arch.ADDRESS_MASK;

Start in packages/contracts-bedrock/src/cannon/MIPS64.sol at the syscall argument handling around line 584. Trace how a1 is masked with arch.ADDRESS_MASK and inspect nearby syscall logic and tests, if present. Done means a misaligned pointer causes an explicit failure instead of being silently aligned.

Written by the indexing model from the issue text.