[TRIVIAL] autopilot-svm: log landed tx signatures as base58

[tilacog]

Description

The autopilot logged landed settlement signatures as hex while the driver logs them as base58, making it hard to correlate the same transaction across the two components' logs.

Changes

• autopilot-svm: render tx_signature via chain_types::solana::Signature (base58 Display) instead of const_hex::encode in the "settlement observed on chain" log

[claude]

Claude finished @tilacog's task in 36s —— View job

---

PR Review

• Read the diff and surrounding code
• Verify Signature type and its base58 Display
• Check consistency with the driver

LGTM. This is a correct, well-scoped change.

• landed.submitted_signature is a ByteArray<64>, so .0 is [u8; 64] — exactly what chain_types::solana::Signature(pub [u8; 64]) wraps, and its Display renders base58 (crates/chain-types/src/solana.rs:93). Type-safe, no behavior change beyond the log format.
• Consistent with the driver DTO, which already types tx_signature as Signature (crates/autopilot-svm/src/infra/driver/dto.rs:142), so signatures now line up across both components' logs as intended.

No issues to flag.
· svm-log-signatures-base58

[squadgazzz]

We need to double check other places. I think today I bumped into other fields with the similar issue.