Persist XMR outbound transparency metadata

Boone Wrequested to merge
boonew/xmr-transparency-sidecar-2026-05-09 into next

Summary

Companion signer-side branch for the Thornode XMR transparency work.

  • persists XMR outbound tx keys / transparency metadata from the signer path
  • exposes the stored outbound metadata through the sidecar API used by Thornode
  • keeps the current XMR signer chainnet/network-prefix support in the branch baseline

Local validation

  • cargo fmt -p xmr-frost-signer -- --check
  • cargo clippy -p xmr-frost-signer -- -D warnings
  • cargo test -p xmr-frost-signer
  • local signer image built as local/xmr-frost-signer:dev and used by Thornode local CI

Thornode companion

This is intended to pair with the new Thornode boonew/xmr-transparency-2026-05-09 MR.

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