perf(store): optimize UpdateReadSet allocation pattern

[pdrobnjak]

Summary

• Optimize allocation pattern in UpdateReadSet to reduce GC pressure

Stack

2/13 — depends on perf/hybrid-syncmap-rwmutex

🤖 Generated with Claude Code

[github-actions]

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Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	Feb 11, 2026, 12:52 PM

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 56.66%. Comparing base (2b3cec4) to head (b97b114).

Additional details and impacted files

@@                       Coverage Diff                       @@
##           perf/hybrid-syncmap-rwmutex    #2837      +/-   ##
===============================================================
- Coverage                        56.68%   56.66%   -0.03%     
===============================================================
  Files                             2031     2031              
  Lines                           165988   165990       +2     
===============================================================
- Hits                             94092    94052      -40     
- Misses                           63664    63697      +33     
- Partials                          8232     8241       +9     

Flag	Coverage Δ
sei-chain	41.52% <66.66%> (-0.01%)	⬇️
sei-cosmos	48.17% <100.00%> (+<0.01%)	⬆️
sei-db	68.72% <ø> (ø)
sei-tendermint	58.05% <ø> (-0.08%)	⬇️

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Files with missing lines	Coverage Δ
sei-cosmos/store/multiversion/mvkv.go	90.90% <100.00%> (+0.11%)	⬆️

... and 29 files with indirect coverage changes

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[pdrobnjak]

This PR was auto-merged by GitHub during a stack reorder (branch force-push made head appear merged into base). No code was actually merged to main. This PR has been superseded — see the restacked PR chain starting at #2849.