perf: cache block-level constants in executeEVMTxWithGigaExecutor

[pdrobnjak]

Summary

• Cache block-constant EVM values (ChainID, BlockContext, ChainConfig, BaseFee) once per block, eliminating redundant store reads, Keccak256 hashing, and big.Int allocations per transaction
• These values are identical for every tx in a block but were recomputed on every call to executeEVMTxWithGigaExecutor
• Cache is populated in both giga execution paths:
  • ProcessTxsSynchronousGiga — sequential path (non-OCC)
  • ProcessTXsWithOCCGiga — parallel OCC path

Allocation reduction (heap diff, alloc_space)

Function	Reduction
GetVMBlockContext	-6.17 GB
VersionIndexedStore.UpdateReadSet	-2.56 GB
VersionIndexedStore.Get	-2.88 GB
Dec.UnmarshalJSON (params)	-3.08 GB
json.Unmarshal (params)	-2.13 GB
gaskv.NewStore	-1.50 GB
Total	~11.3 GB fewer allocs

TPS is roughly flat — the win is in reduced GC pressure from eliminating ~11 GB of redundant allocations per 300s run.

Test plan

• go build ./app/... compiles cleanly
• gofmt -s -l app/app.go produces no output
• Benchmark comparison: both baseline and candidate complete 300s runs
• Profile diff confirms allocation reductions in target functions
• CI passes

🤖 Generated with Claude Code

[github-actions]

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Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	Feb 17, 2026, 1:18 PM

[codecov]

Codecov Report

❌ Patch coverage is 66.66667% with 20 lines in your changes missing coverage. Please review.
✅ Project coverage is 57.22%. Comparing base (8fc1d5b) to head (fce7d6a).

Files with missing lines	Patch %	Lines
app/app.go	66.66%	14 Missing and 6 partials ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2899   +/-   ##
=======================================
  Coverage   57.21%   57.22%           
=======================================
  Files        2093     2093           
  Lines      171755   171750    -5     
=======================================
+ Hits        98276    98285    +9     
+ Misses      64709    64687   -22     
- Partials     8770     8778    +8     

Flag	Coverage Δ
sei-chain	52.69% <66.66%> (-0.01%)	⬇️
sei-cosmos	48.18% <ø> (+0.03%)	⬆️
sei-db	68.72% <ø> (ø)

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

Files with missing lines	Coverage Δ
app/app.go	72.97% <66.66%> (+0.22%)	⬆️

... and 29 files with indirect coverage changes

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