Fix lint issues and clean up simulation gas accounting

[masih]

Align simulation ante wiring with upstream and add a dedicated simulation VM Pass wasmkeeper.DefaultGasMeterSetter() to NewLimitSimulationGasDecorator in app/ante.go to match the reference wiring at sei-wasmd/app/ante.go.

Add a dedicated simulationWasmVM on Keeper alongside the existing rpcWasmVM, plus an IsSimulation flag on sdk.Context that BaseApp.runTx sets for runTxModeSimulate. Keeper.getWasmer returns the dedicated VM for simulate-mode contexts, mirroring the existing tracing wiring.

Adds unit tests for the ante wiring, the context flag, and the engine selection.

[github-actions]

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Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	May 18, 2026, 2:17 PM

[cursor]

PR Summary

Medium Risk
Changes how simulation mode is flagged and how the wasm keeper selects its execution engine, which can affect gas accounting and simulation behavior across the stack. Impact should be limited to runTxModeSimulate, but it touches BaseApp/sdk.Context and wasm VM initialization paths.

Overview
Aligns simulation ante wiring by switching NewLimitSimulationGasDecorator to use wasmkeeper.DefaultGasMeterSetter(), and adds a unit test to ensure the simulation gas limit and Cosmos gas multiplier are applied as expected.

Introduces an IsSimulation flag on sdk.Context (set by BaseApp.runTx during runTxModeSimulate) and updates the wasm keeper to instantiate and route simulation contexts to a dedicated simulationWasmVM, with tests covering the new context flag and engine selection.

Includes a small lint/security-scan suppression for safe uint64→int64 conversion in fee checking.

^{Reviewed by Cursor Bugbot for commit a88e401. Bugbot is set up for automated code reviews on this repo. Configure here.}

[codecov]

Codecov Report

❌ Patch coverage is 80.00000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 59.30%. Comparing base (b671648) to head (a88e401).

Files with missing lines	Patch %	Lines
sei-wasmd/x/wasm/keeper/keeper.go	66.66%	1 Missing and 1 partial ⚠️
app/ante/cosmos_checktx.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3455   +/-   ##
=======================================
  Coverage   59.29%   59.30%           
=======================================
  Files        2126     2126           
  Lines      175702   175714   +12     
=======================================
+ Hits       104183   104200   +17     
+ Misses      62448    62440    -8     
- Partials     9071     9074    +3     

Flag	Coverage Δ
sei-chain-pr	70.23% <80.00%> (?)
sei-db	70.41% <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.go	64.51% <100.00%> (ø)
sei-cosmos/baseapp/baseapp.go	75.29% <100.00%> (+0.09%)	⬆️
sei-cosmos/types/context.go	90.53% <100.00%> (+0.18%)	⬆️
app/ante/cosmos_checktx.go	37.56% <0.00%> (-0.55%)	⬇️
sei-wasmd/x/wasm/keeper/keeper.go	85.93% <66.66%> (-0.17%)	⬇️

... and 32 files with indirect coverage changes

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