feat: Giga RPC node (OCC execution)

[arajasek]

This is a followup to #2708 adding support for OCC mode to Giga RPC nodes. The logic is:

• Make a list of EVM txs and non-EVM txs
• Run EVM txs in parallel
  • If they fail due to interop, throw away all your work and just use the v2 logic for ALL txs
• Run non-EVM txs in parallel

[github-actions]

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Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	Feb 4, 2026, 1:04 AM

[codecov]

Codecov Report

❌ Patch coverage is 53.48837% with 40 lines in your changes missing coverage. Please review.
✅ Project coverage is 56.62%. Comparing base (4d7369c) to head (b3bf8c0).

Files with missing lines	Patch %	Lines
app/app.go	56.96%	28 Missing and 6 partials ⚠️
utils/metrics/metrics_util.go	0.00%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2768      +/-   ##
==========================================
- Coverage   56.65%   56.62%   -0.03%     
==========================================
  Files        2031     2031              
  Lines      165854   165929      +75     
==========================================
- Hits        93959    93957       -2     
- Misses      63664    63745      +81     
+ Partials     8231     8227       -4     

Flag	Coverage Δ
sei-chain	41.47% <53.48%> (-0.04%)	⬇️
sei-cosmos	48.13% <100.00%> (+0.01%)	⬆️
sei-db	68.72% <ø> (ø)
sei-tendermint	58.08% <ø> (+0.01%)	⬆️

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

Files with missing lines	Coverage Δ
giga/executor/utils/errors.go	0.00% <ø> (ø)
sei-cosmos/store/cachemulti/store.go	70.47% <100.00%> (ø)
utils/metrics/metrics_util.go	70.47% <0.00%> (-1.60%)	⬇️
app/app.go	66.14% <56.96%> (-5.11%)	⬇️

... and 21 files with indirect coverage changes

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[codchen]

nit: should we call this v2Scheduler since it may still process evm txs?