Optimize conflict-heavy EVM transfer block execution

[codchen]

Summary

• Adds local EVM stress tooling for the mainnet-shaped workload: many brand-new EVM senders submitting simple transfers to the same recipient.
• Adds OCC scheduler conflict logging for both sei-cosmos/tasks/scheduler.go and giga/deps/tasks/scheduler.go, including the store key names and aggregate conflict counts per block.
• Adds x/evm EndBlock latency logs for the major sections of end-block processing, plus a total wall-time log.
• Reduces EVM association overhead by reusing an already-preprocessed derived sender in DeliverTx, reusing an empty cast auth account when safe, and skipping direct-cast self migration.
• Detects large simple EVM transfer blocks that all target the same recipient and routes them through the sequential execution path instead of OCC. This now applies to both the regular V2 path and the Giga path.

Stress Results

• Before the optimization, the local stress workload produced large blocks taking roughly 1.5s-3.3s under OCC, with conflicts on acc/globalAccountNumber and the shared recipient bank keys.
• After the changes, the same local stress script produced roughly 0.30s-0.35s total execution time for ~1k tx blocks, with the conflict-heavy transfer shape avoiding OCC retry churn.

Test Plan

• go test ./app ./utils/helpers ./app/ante ./x/evm/ante ./x/evm/types
• Ran ./scripts/evm_stress.sh locally and confirmed large same-recipient transfer blocks execute around 300ms-350ms
• Confirmed OCC conflict logs and EVM EndBlock latency logs are emitted for the intended paths

[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	May 6, 2026, 3:52 AM

[codecov]

Codecov Report

❌ Patch coverage is 38.42105% with 117 lines in your changes missing coverage. Please review.
✅ Project coverage is 59.07%. Comparing base (fad6d58) to head (9a4abc1).

Files with missing lines	Patch %	Lines
scripts/evm_stress/main.go	0.00%	73 Missing ⚠️
giga/deps/tasks/scheduler.go	0.00%	24 Missing ⚠️
app/app.go	50.00%	9 Missing and 2 partials ⚠️
app/ante/evm_delivertx.go	45.45%	3 Missing and 3 partials ⚠️
sei-cosmos/tasks/scheduler.go	87.50%	1 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3376      +/-   ##
==========================================
- Coverage   59.10%   59.07%   -0.03%     
==========================================
  Files        2101     2102       +1     
  Lines      173162   173337     +175     
==========================================
+ Hits       102344   102402      +58     
- Misses      61943    62053     +110     
- Partials     8875     8882       +7     

Flag	Coverage Δ
sei-chain-pr	56.86% <38.42%> (?)
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
sei-cosmos/baseapp/abci.go	63.00% <100.00%> (+1.07%)	⬆️
sei-cosmos/baseapp/baseapp.go	75.80% <ø> (ø)
sei-cosmos/store/multiversion/store.go	91.96% <100.00%> (+0.29%)	⬆️
utils/helpers/associate.go	72.72% <100.00%> (+7.34%)	⬆️
sei-cosmos/tasks/scheduler.go	94.88% <87.50%> (-0.74%)	⬇️
app/ante/evm_delivertx.go	67.74% <45.45%> (-4.81%)	⬇️
app/app.go	69.55% <50.00%> (-0.30%)	⬇️
giga/deps/tasks/scheduler.go	84.26% <0.00%> (-7.35%)	⬇️
scripts/evm_stress/main.go	0.00% <0.00%> (ø)

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