Skip signature event building during Cosmos CheckTx/ReCheckTx

[amir-deris]

Summary

• During CheckTx and ReCheckTx, CheckSignatures was unconditionally building signature events (account sequence formatting, SignatureDataToBz, base64 encoding) even though CosmosCheckTxAnte discards them with _.
• Added a skipSigEvents guard so this work is skipped when ctx.IsCheckTx() || ctx.IsReCheckTx() — reducing allocations and CPU on the highest-frequency ante path.
• CosmosDeliverTxAnte is unaffected: its context always has both flags false, so events are still built and emitted normally.

Result

In branch amir/PLT-218-analyze-app-performance, running 4 node cluster and doing sei-chain/loadtest for Cosmos Bank and Staking transaction types, and taking pprof CPU profiles at specific heights, we observe about 15% less CPU usage in CosmosCheckTxAnte.

[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	Apr 10, 2026, 10:02 PM

[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	Apr 10, 2026, 10:02 PM

[codecov]

Codecov Report

❌ Patch coverage is 75.00000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 59.01%. Comparing base (786863f) to head (2a3795e).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
app/ante/cosmos_checktx.go	75.00%	1 Missing and 2 partials ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3230   +/-   ##
=======================================
  Coverage   59.01%   59.01%           
=======================================
  Files        2065     2065           
  Lines      169369   169371    +2     
=======================================
+ Hits        99956    99960    +4     
+ Misses      60649    60648    -1     
+ Partials     8764     8763    -1     

Flag	Coverage Δ
sei-chain-pr	48.14% <75.00%> (?)
sei-db	70.41% <ø> (ø)

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

Files with missing lines	Coverage Δ
app/ante/cosmos_checktx.go	36.48% <75.00%> (+0.88%)	⬆️

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