perf: hollow CMS for OCC prepareTask

[pdrobnjak]

Summary

• Adds CacheMultiStoreForOCC to cachemulti.Store that creates a hollow CMS where stores are populated directly from VersionIndexedStores via handler functions
• The OCC scheduler's prepareTask now uses this instead of CacheMultiStore() + SetKVStores() + SetGigaKVStores(), skipping creation of ~20 intermediate cachekv instances that were immediately discarded
• Eliminates ~10 GB of allocations in the prepareTask path per 120s benchmark run
• Falls back to the original CacheMultiStore + SetKVStores path when the multistore doesn't implement the occPreparer interface

Test plan

• go test ./sei-cosmos/store/cachemulti/... — all pass
• go test ./giga/deps/xevm/state/... — all pass
• go build ./... — builds clean
• Benchmark: GIGA_SUPPRESS_COSMOS_EVENTS=true benchmark/benchmark-compare.sh baseline=7d7ab4f99 candidate=7d2cd92ee
  • Baseline: Median 6985, Avg 6836
  • Candidate: Median 7000, Avg 6927
  • Alloc diff: -10.3 GB cumulative in prepareTask, -6.8 GB in cachekv.NewStore

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[github-actions]

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Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	Feb 18, 2026, 1:52 PM

[codecov]

Codecov Report

❌ Patch coverage is 75.67568% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 57.24%. Comparing base (07025b9) to head (bc3f63e).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
giga/deps/tasks/scheduler.go	55.00%	9 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2914      +/-   ##
==========================================
+ Coverage   57.22%   57.24%   +0.01%     
==========================================
  Files        2094     2099       +5     
  Lines      171956   172439     +483     
==========================================
+ Hits        98400    98707     +307     
- Misses      64739    64871     +132     
- Partials     8817     8861      +44     

Flag	Coverage Δ
sei-chain	52.72% <75.67%> (-0.02%)	⬇️
sei-cosmos	48.18% <0.00%> (-0.02%)	⬇️
sei-db	68.72% <ø> (?)

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

Files with missing lines	Coverage Δ
sei-cosmos/store/cachemulti/store.go	75.15% <100.00%> (+0.15%)	⬆️
giga/deps/tasks/scheduler.go	88.92% <55.00%> (-2.69%)	⬇️

... and 29 files with indirect coverage changes

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