Fix ProteinMPNN Docker login and bind local inference to loopback

[ohadmo]

No description provided.

[ohadmo]

@greptileai

[ohadmo]

/nvskills-ci

[greptile-apps]

Confidence Score: 5/5

[Low risk] Documentation updates for Docker setup and skill metadata.

The PR appears safe to merge; no actionable new issue was established.

Summary

The PR adds registry login and loopback-only port publishing to the ProteinMPNN Docker examples, updates the skill description and evaluation figures, and refreshes the skill signature.

• The two Docker references give the same command.
• The refreshed signature lists resources whose paths and hashes match the current skill files.

_{Reviews (2) · Last reviewed commit: "Attach NVSkills validation signatures"}