Backport release/v6.7: Count only connected peers in /net_info n_peers

[seidroid]

Backport of #4500 to release/v6.7.

[cursor]

PR Summary

Low Risk
RPC response semantics change for n_peers only; monitoring or scripts that assumed the old inflated count may need updating, but behavior now matches connected peers.

Overview
Fixes /net_info so n_peers reflects active connections (len(peerConnections)) instead of every known address from AllAddrs() (including PEX gossip).

The peers list is unchanged and still includes all known peer URLs; only the count semantics change. Comments on NetInfo now document that n_peers matches peer_connections, while peers can be larger.

Adds integration tests: connected-peer count on a hub topology, and a PEX case where peers can exceed n_peers when a node is address-known but not connected.

^{Reviewed by Cursor Bugbot for commit 840d724. Bugbot is set up for automated code reviews on this repo. Configure here.}

[seidroid]

This clean backport of #4500 makes /net_info n_peers count connected peers (len(peerConnections)) rather than every known address. It adds tests for the connected-peer count and for PEX-learned addresses. The test helpers it relies on (MakeTestNetwork, TestNodeOptions.PexOnHandshake/SelfAddress/MaxConnected, TestNode.Connect) already exist on the target branch.

Findings: 0 blocking | 0 non-blocking | 0 posted inline

Blockers

• None at the file/PR level.

Non-blocking

• None at the file/PR level.

[github-actions]

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Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	Oct 12, 2026, 2:28 PM

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 60.80%. Comparing base (206d3ce) to head (840d724).

Additional details and impacted files

@@               Coverage Diff                @@
##           release/v6.7    #4515      +/-   ##
================================================
- Coverage         61.84%   60.80%   -1.04%     
================================================
  Files              2168     2068     -100     
  Lines            188740   176780   -11960     
================================================
- Hits             116727   107499    -9228     
+ Misses            61159    59398    -1761     
+ Partials          10854     9883     -971     

Flag	Coverage Δ
sei-chain-pr	32.90% <100.00%> (?)
sei-db	69.80% <ø> (ø)
sei-db-state-db	?

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
sei-tendermint/internal/rpc/core/net.go	68.42% <100.00%> (+18.42%)	⬆️

... and 100 files with indirect coverage changes

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