Unclear cleanup of weights and bonds on deregistration or stake loss

[Miracle0524]

Unclear cleanup of weights and bonds on deregistration or stake loss

Summary

It is unclear whether weight and bond entries are removed when a neuron is deregistered, loses vpermit, or falls below minimum stake.

Problem

• Weight and bond storage may persist beyond neuron lifecycle.
• No clear guarantees exist for cleanup in all exit paths.
• Potential for long-term accumulation of orphaned matrices.

Details

• Storage layout:
  (netuid, neuron_uid) -> Vec<(uid, weight)>
• One entry per validator per subnet.

Expected Outcome

• Audit of cleanup behavior across all exit paths.
• Explicit removal of weights and bonds for inactive neurons.
• Prevention of silent chain state growth.

Context

Filed at the request of Rhef to enable supervised investigation and fix.