Refactor of p2p secret connection

[pompon0]

Refactored secret connection implementation, preparing it to multiplex between v2 and giga connections during handshake. In particular the handshake is now context aware. Additional changes:

• removed gogo annotations from p2p protos
• merged crypto/encoding package into crypto (for simplicity)

[github-actions]

The latest Buf updates on your PR. Results from workflow Buf / buf (pull_request).

Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	Jan 5, 2026, 5:46 PM

[codecov]

Codecov Report

❌ Patch coverage is 73.99103% with 58 lines in your changes missing coverage. Please review.
✅ Project coverage is 43.78%. Comparing base (9fda687) to head (6420423).

Files with missing lines	Patch %	Lines
...-tendermint/internal/p2p/conn/secret_connection.go	85.13%	15 Missing and 7 partials ⚠️
sei-cosmos/crypto/codec/tm.go	0.00%	12 Missing ⚠️
sei-tendermint/crypto/conv.go	23.07%	10 Missing ⚠️
sei-tendermint/test/e2e/app/app.go	0.00%	4 Missing ⚠️
sei-tendermint/abci/tests/server/client.go	0.00%	3 Missing ⚠️
sei-cosmos/x/simulation/mock_tendermint.go	0.00%	2 Missing ⚠️
sei-tendermint/abci/types/types.go	0.00%	2 Missing ⚠️
sei-tendermint/crypto/ed25519/ed25519.go	90.00%	1 Missing and 1 partial ⚠️
sei-tendermint/internal/p2p/conn/connection.go	87.50%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2650   +/-   ##
=======================================
  Coverage   43.78%   43.78%           
=======================================
  Files        1904     1903    -1     
  Lines      158932   158907   -25     
=======================================
- Hits        69585    69581    -4     
+ Misses      82944    82929   -15     
+ Partials     6403     6397    -6     

Flag	Coverage Δ
sei-chain	45.81% <ø> (-0.01%)	⬇️
sei-cosmos	38.20% <0.00%> (-0.01%)	⬇️
sei-db	69.06% <ø> (ø)
sei-tendermint	47.32% <78.94%> (+0.04%)	⬆️

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

Files with missing lines	Coverage Δ
sei-tendermint/internal/p2p/pex/reactor.go	89.24% <100.00%> (ø)
sei-tendermint/internal/p2p/transport.go	71.12% <100.00%> (ø)
sei-tendermint/internal/state/execution.go	61.47% <100.00%> (ø)
sei-tendermint/privval/grpc/client.go	50.00% <100.00%> (ø)
sei-tendermint/privval/grpc/server.go	100.00% <100.00%> (ø)
sei-tendermint/privval/signer_client.go	58.06% <100.00%> (+1.14%)	⬆️
sei-tendermint/privval/signer_requestHandler.go	55.55% <100.00%> (ø)
sei-tendermint/types/protobuf.go	90.47% <100.00%> (ø)
sei-tendermint/internal/p2p/conn/connection.go	81.99% <87.50%> (ø)
sei-cosmos/x/simulation/mock_tendermint.go	0.00% <0.00%> (ø)
... and 7 more

... and 16 files with indirect coverage changes

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