Fix Ledger Tests to be Feature-Gated

[devin-ai-integration]

Fix Ledger Tests to be Feature-Gated

This PR fixes the CI failure in PR #31 by properly feature-gating the Ledger wallet tests. The issue was that the CI workflow runs tests with --no-default-features, but the Ledger implementation requires the ledger feature to be enabled.

Changes

• Added #[cfg(feature = "ledger")] to the Ledger tests module
• Wrapped the test in a module to ensure proper feature-gating
• No changes to the actual implementation

This ensures that the tests are only compiled and run when the ledger feature is enabled, preventing compilation errors when running with --no-default-features.

Link to Devin run: https://app.devin.ai/sessions/bc2a0d70f17f44518478567e1d0f8730
Requested by: Jimmy

[devin-ai-integration]

🤖 Devin AI Engineer

I'll be helping with this pull request! Here's what you should know:

✅ I will automatically:

• Address comments on this PR. Add "(aside)" to your comment to have me ignore it.
• Look at CI failures and help fix them

Note: I can only respond to comments from users who have write access to this repository.

⚙️ Control Options:

• Disable automatic comment and CI monitoring