Verify removal of rank, trust, and pruning_score from runtime and chain state

[Miracle0524]

Verify removal of rank, trust, and pruning_score from runtime and chain state

Summary

The fields rank, trust, and pruning_score were previously identified as unused or obsolete, but it is unclear whether they have been fully removed from runtime logic and chain state.

Problem

• Some fields appear unused in production logic.
• It is unclear whether these fields still exist in storage or metagraph outputs.
• SDK breaking changes depend on confirmation of removal.

Current Status

• Pruning logic was partially reworked.
• Registration changes are still in progress.
• Removal status of these fields has not been confirmed.

Expected Outcome

• Audit of runtime logic and storage.
• Clear confirmation of which fields remain.
• Removal or explicit deprecation of obsolete fields.

Context

Filed at the request of Rhef to verify current state and unblock follow-up cleanup.