Remove live IBC transfer module

[masih]

Remove ICS-20 module wiring, APIs, CLI commands, and CosmWasm integration.

Retire the live IBC precompile while preserving legacy implementations and codecs for historical tracing and transaction decoding. Keep the transfer store and module account mounted for historical state safety, and remove its module version during the v6.7 upgrade.

[github-actions]

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Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	Aug 25, 2026, 8:39 AM

[codecov]

Codecov Report

❌ Patch coverage is 88.70968% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 57.58%. Comparing base (776d565) to head (5817e97).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
precompiles/ibc/ibc.go	68.75%	3 Missing and 2 partials ⚠️
sei-wasmd/x/wasm/keeper/handler_plugin_encoders.go	83.33%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3981      +/-   ##
==========================================
- Coverage   59.08%   57.58%   -1.50%     
==========================================
  Files        2305     2225      -80     
  Lines      197021   185842   -11179     
==========================================
- Hits       116402   107011    -9391     
+ Misses      69858    69048     -810     
+ Partials    10761     9783     -978     

Flag	Coverage Δ
sei-chain-pr	64.19% <88.70%> (?)
sei-db	69.80% <ø> (ø)
sei-db-state-db	?

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

Files with missing lines	Coverage Δ
app/app.go	71.65% <100.00%> (-0.27%)	⬇️
app/precompiles.go	100.00% <ø> (ø)
app/upgrades.go	45.28% <100.00%> (+1.05%)	⬆️
docs/swagger/statik.go	100.00% <ø> (ø)
giga/deps/xevm/keeper/address.go	84.31% <ø> (-2.58%)	⬇️
giga/deps/xevm/keeper/keeper.go	61.63% <100.00%> (-0.17%)	⬇️
precompiles/ibc/setup.go	91.66% <100.00%> (+0.75%)	⬆️
precompiles/utils/expected_keepers.go	100.00% <ø> (ø)
sei-db/common/keys/store_keys.go	100.00% <ø> (ø)
sei-wasmd/app/app.go	78.09% <100.00%> (-1.03%)	⬇️
... and 11 more

... and 261 files with indirect coverage changes

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[cursor]

PR Summary

High Risk
Disables ICS-20 cross-chain transfers and related APIs/precompile wiring—a breaking protocol change affecting IBC relayers, CosmWasm contracts, and indexers that relied on transfer queries on full nodes.

Overview
Removes live ICS-20 token transfer from the chain binary: the transfer keeper, app module, IBC port route, params subspace, and genesis wiring are dropped, along with CosmWasm and EVM keeper dependencies and IBC-related precompile keeper injection.

State compatibility is preserved by keeping the transfer KV store in kvStoreKeyNames, retaining the transfer module account permissions, materializing that module account at genesis via initializeRetiredTransferModuleAccount, and dropping only the module version entry on the v6.7 upgrade (alongside capability and feegrant). Tests assert the store stays writable and the retired module account remains present.

Operator and client impact is documented in CHANGELOG.md and README.md: v6.7 nodes no longer serve transfer queries, historical transfer tx decoding, or pre-v6.7 IBC precompile tracing—those need v6.6 freeze nodes. Swagger/OpenAPI entries for ibc/apps/transfer are removed to match the retired APIs.

^{Reviewed by Cursor Bugbot for commit 5817e97. Bugbot is set up for automated code reviews on this repo. Configure here.}

[seidroid]

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