skip LastResultsHash check if giga executor is on

[codchen]

Describe your changes and provide context

Giga executors may yield different gas usage than v2 executors due to:

• more parity with Ethereum
• optimized state access pattern
  Since we only care about state consistency, which is covered by AppHash, we don't need to require lastResultsHash on nodes that enabled giga.

Testing performed to validate your change

patch on giga-enabled RPC nodes

[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	Feb 12, 2026, 4:35 AM

[codecov]

Codecov Report

❌ Patch coverage is 66.66667% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 57.07%. Comparing base (7db2f0a) to head (cffaeaa).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
app/test_helpers.go	0.00%	1 Missing ⚠️
sei-tendermint/light/rpc/client.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #2866       +/-   ##
===========================================
+ Coverage   48.32%   57.07%    +8.75%     
===========================================
  Files         671     2090     +1419     
  Lines       50576   171162   +120586     
===========================================
+ Hits        24439    97696    +73257     
- Misses      23998    64775    +40777     
- Partials     2139     8691     +6552     

Flag	Coverage Δ
sei-chain	52.53% <66.66%> (?)
sei-cosmos	48.13% <ø> (-0.01%)	⬇️
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	65.90% <100.00%> (ø)
sei-tendermint/internal/state/execution.go	80.42% <100.00%> (ø)
sei-tendermint/internal/state/validation.go	100.00% <100.00%> (ø)
sei-tendermint/types/block.go	87.88% <ø> (ø)
sei-tendermint/types/evidence.go	77.65% <100.00%> (ø)
app/test_helpers.go	40.13% <0.00%> (ø)
sei-tendermint/light/rpc/client.go	0.00% <0.00%> (ø)

... and 1535 files with indirect coverage changes

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[arajasek]

Does this actually work? I think you're just skipping the log, but still returning the error here, so I don't think SkipLastResultsHashValidation actually does anything.