Made tcp connection context-aware

[pompon0]

This simplifies usage of the connection (connection errors are not leaked all over the place) at the cost of running a background task for connection management. Additionally:

• added a NodeSecretKey/NodePublicKey wrappers of ed25519 keys, which can be solely used for connection authentication (domain separation from validator keys)
• rewritten (deprecated) protoio to handle context-aware connections
• moved authentication from SecretConnection to Router.handshake, which will eventually also handle handshaking the giga p2p connections.
• Moved p2p proto messages to use the the upstream proto generator.
• renamed import from "proto" to (deprecated) "gogoproto" within sei-tendermint/internal to avoid collision with the upstream proto library that will replace gogoproto.

[github-actions]

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Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	Jan 21, 2026, 5:30 PM

[codecov]

Codecov Report

❌ Patch coverage is 58.46154% with 162 lines in your changes missing coverage. Please review.
✅ Project coverage is 44.03%. Comparing base (65c8ad5) to head (70e2a97).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
sei-tendermint/libs/utils/tcp/tcp.go	18.66%	61 Missing ⚠️
sei-tendermint/internal/p2p/transport.go	69.84%	11 Missing and 8 partials ⚠️
sei-tendermint/internal/mux/mux.go	35.71%	8 Missing and 10 partials ⚠️
...-tendermint/internal/p2p/conn/secret_connection.go	72.30%	11 Missing and 7 partials ⚠️
sei-tendermint/internal/p2p/conn/protoio.go	55.17%	9 Missing and 4 partials ⚠️
sei-tendermint/internal/protoutils/msg.go	0.00%	8 Missing ⚠️
sei-tendermint/internal/p2p/conn/connection.go	80.55%	4 Missing and 3 partials ⚠️
sei-tendermint/internal/protoutils/conv.go	0.00%	7 Missing ⚠️
sei-tendermint/internal/p2p/conv.go	82.35%	3 Missing and 3 partials ⚠️
sei-tendermint/internal/p2p/router.go	87.17%	4 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2718      +/-   ##
==========================================
+ Coverage   44.01%   44.03%   +0.02%     
==========================================
  Files        1984     1986       +2     
  Lines      162891   162970      +79     
==========================================
+ Hits        71694    71762      +68     
- Misses      84670    84688      +18     
+ Partials     6527     6520       -7     

Flag	Coverage Δ
sei-chain	46.20% <ø> (-0.01%)	⬇️
sei-cosmos	38.06% <ø> (+<0.01%)	⬆️
sei-db	68.72% <ø> (ø)
sei-tendermint	47.51% <58.46%> (+0.09%)	⬆️

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

Files with missing lines	Coverage Δ
sei-tendermint/internal/mux/stream_state.go	87.50% <ø> (-0.26%)	⬇️
sei-tendermint/internal/p2p/testonly.go	68.94% <100.00%> (ø)
sei-tendermint/node/setup.go	66.54% <100.00%> (ø)
sei-tendermint/internal/p2p/router.go	76.80% <87.17%> (+4.16%)	⬆️
sei-tendermint/internal/p2p/conv.go	82.35% <82.35%> (ø)
sei-tendermint/internal/p2p/conn/connection.go	80.00% <80.55%> (-1.65%)	⬇️
sei-tendermint/internal/protoutils/conv.go	0.00% <0.00%> (ø)
sei-tendermint/internal/protoutils/msg.go	0.00% <0.00%> (ø)
sei-tendermint/internal/p2p/conn/protoio.go	55.17% <55.17%> (ø)
sei-tendermint/internal/mux/mux.go	75.00% <35.71%> (+1.05%)	⬆️
... and 3 more

... and 13 files with indirect coverage changes

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