Optimize attestation message construction

[martinjms]

Summary

In condition_attestation.move, the message for signature verification is built by creating 4 separate BCS-encoded vectors and appending them one by one:

let mut msg = vector[];
let char_bytes = bcs::to_bytes(&char_game_id);
let assembly_bytes = bcs::to_bytes(&assembly_id);
let condition_bytes = bcs::to_bytes(&condition_id);
let time_bytes = bcs::to_bytes(&timestamp_ms);
msg.append(char_bytes);
msg.append(assembly_bytes);
msg.append(condition_bytes);
msg.append(time_bytes);

This creates 4 allocations + 4 vector copies. Could be replaced with a single tuple encoding:

let msg = bcs::to_bytes(&(char_game_id, assembly_id, condition_id, timestamp_ms));

Impact

~30-50% gas reduction on attestation condition verification. Low effort change.

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