Marvin Jones 0fd7e8e0f9 fix(keycard): address PR #595 review comments
- Propagate the load_mnemonic error instead of swallowing it behind
  is_ok(), matching every other command handler in this file.
- Add deny.toml allowing the keycard-rs git source, fixing the
  source-not-allowed failure in `cargo deny check`. Licenses and
  advisories checks still have pre-existing, separate failures not
  addressed here.
- Drop the pinned rev for the keycard-rs git dependency so it tracks
  the upstream default branch instead.
2026-07-08 09:49:48 -04:00
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