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 5, 2026, 2:03 PM

[codecov]

Codecov Report

❌ Patch coverage is 52.94118% with 40 lines in your changes missing coverage. Please review.
✅ Project coverage is 56.66%. Comparing base (ec9e52e) to head (e1160e5).
⚠️ Report is 1 commits behind head on main.

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   46.94%   56.66%   +9.72%     
==========================================
  Files        1965     2031      +66     
  Lines      160525   165929    +5404     
==========================================
+ Hits        75352    94028   +18676     
+ Misses      78643    63670   -14973     
- Partials     6530     8231    +1701     

Flag	Coverage Δ
sei-chain	41.51% <52.94%> (+<0.01%)	⬆️
sei-cosmos	48.12% <ø> (+<0.01%)	⬆️
sei-db	68.72% <ø> (ø)
sei-tendermint	58.09% <ø> (?)

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)
utils/metrics/metrics_util.go	70.47% <0.00%> (-1.60%)	⬇️
app/app.go	66.14% <56.96%> (-5.11%)	⬇️

... and 316 files with indirect coverage changes

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[codchen]

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

[arajasek]

sounds good, thank you