Always set gas meter for every transaction

[codchen]

Describe your changes and provide context

Setting gas meter should be the very first thing when handling a transaction. If that's not the case and the handler exits for whatever reason, the upstream logic will use the common gas meter set at the beginning of FinalizeBlock as the transaction's gas meter, which can cause unexpected results.

Testing performed to validate your change

local cluster

[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	Dec 11, 2025, 2:06 PM

[codecov]

Codecov Report

❌ Patch coverage is 0% with 15 lines in your changes missing coverage. Please review.
✅ Project coverage is 43.25%. Comparing base (cf02339) to head (b1f2d06).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
app/ante/cosmos_checktx.go	0.00%	10 Missing ⚠️
app/ante/cosmos_delivertx.go	0.00%	5 Missing ⚠️

❌ Your project status has failed because the head coverage (38.27%) is below the target coverage (40.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2583      +/-   ##
==========================================
- Coverage   43.25%   43.25%   -0.01%     
==========================================
  Files        1850     1850              
  Lines      152293   152294       +1     
==========================================
- Hits        65881    65869      -12     
- Misses      80549    80558       +9     
- Partials     5863     5867       +4     

Flag	Coverage Δ
sei-chain	42.07% <0.00%> (-0.04%)	⬇️
sei-cosmos	38.03% <ø> (+<0.01%)	⬆️
sei-db	69.06% <ø> (ø)
sei-ibc-go	55.96% <ø> (ø)
sei-tendermint	47.52% <ø> (+<0.01%)	⬆️
sei-wasmd	42.10% <ø> (ø)
sei-wasmvm	39.88% <ø> (ø)

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

Files with missing lines	Coverage Δ
app/ante/cosmos_delivertx.go	0.00% <0.00%> (ø)
app/ante/cosmos_checktx.go	0.00% <0.00%> (ø)

... and 13 files with indirect coverage changes

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