fix: remove return value from fingerprint command

[shazron]

Fixes #83

Summary

• Removes the return res.certificateFingerprint from the fingerprint command's run() method
• oclif commands should not return values; output is already logged via this.log()

Test plan

• Run aio certificate fingerprint <cert-file> and verify the fingerprint is still printed to stdout
• Verify no regression in other certificate commands

🤖 Generated with Claude Code

[Copilot]

Pull request overview

This PR adjusts the aio certificate fingerprint oclif command behavior by removing its resolved return value, relying solely on this.log() output.

Changes:

• Removed the return res.certificateFingerprint from FingerprintCommand.run().

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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[github-actions]

🤖 PR Reviewer

The diff removes the return value from FingerprintCommand.run() and updates the test to verify behavior via a log spy instead. This is a clean, intentional change that aligns with the CLI command pattern where run() need not return meaningful values. The test update correctly verifies both the undefined resolution and that logging occurred with the expected fingerprint.

✅ LGTM! This PR looks good to merge.

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