Wire up Meter for resource usage tracking

[sanity]

Summary

The Meter struct in crates/core/src/topology/meter.rs provides infrastructure for tracking resource usage (bandwidth) attributed to peers and delegates, but it's not currently wired up.

Current State

• Meter tracks InboundBandwidthBytes and OutboundBandwidthBytes per AttributionSource (Peer or Delegate)
• Uses running averages with configurable window sizes
• Has caching for estimated usage rates
• The report() method is marked #[allow(dead_code)] with // fixme: use this

Why This Matters

Resource usage tracking would enable:

1. Fair resource allocation - identify peers/delegates consuming disproportionate bandwidth
2. Abuse prevention - detect and throttle misbehaving actors
3. Capacity planning - understand actual resource consumption patterns
4. Contract storage decisions - factor resource cost into seeding/eviction (related but separate concern)

Suggested Approach

1. Identify bandwidth consumption points in the networking code
2. Call meter.report() at those points with appropriate attribution
3. Expose usage metrics via the node API for monitoring
4. Consider using the data to inform routing/throttling decisions

Related Code

• crates/core/src/topology/meter.rs - the Meter implementation
• crates/core/src/topology/rate.rs - Rate type used by Meter
• crates/core/src/topology/running_average.rs - RunningAverage used internally

[AI-assisted - Claude]

[github-actions]

🤖 Auto-labeled

Applied labels:

• T-enhancement (95% confidence)
• E-medium (85% confidence)
• A-networking (95% confidence)

Reasoning: The issue describes wiring up an existing Meter implementation (integration/improvement) rather than a bug or entirely new feature, so T-enhancement fits. Work requires locating networking bandwidth accounting points, calling Meter.report(), and exposing metrics — moderate complexity (E-medium). The changes are squarely in networking/topology code, so A-networking is appropriate. No immediate priority or status label is necessary from the provided description.

Previous labels: none

If these labels are incorrect, please update them. This helps improve the auto-labeling system.