Add Asset HUB support to XCM transactor

[manuelmauro]

What does it do?

This PR extends the XCM Transactor pallet to support AssetHub as a transaction destination, enabling Moonbeam users to execute staking operations and other remote calls on the AssetHub system parachain (Polkadot/Kusama/Westend).

What important points should reviewers know?

Is there something left for follow-up PRs?

What alternative implementations were considered?

Are there relevant PRs or issues in other repositories (Substrate, Polkadot, Frontier, Cumulus)?

What value does it bring to the blockchain users?

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✨ Finishing touches

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[github-actions]

WASM runtime size check:

Compared to target branch

Moonbase runtime: 1996 KB (+8 KB) ⚠️

Moonbeam runtime: 2116 KB (+8 KB) ⚠️

Moonriver runtime: 2116 KB (+8 KB) ⚠️

Compared to latest release (runtime-4001)

Moonbase runtime: 1996 KB (+224 KB compared to latest release) ⚠️

Moonbeam runtime: 2116 KB (+252 KB compared to latest release) ⚠️

Moonriver runtime: 2116 KB (+252 KB compared to latest release) ⚠️

[github-actions]

Coverage Report

@@                        Coverage Diff                        @@
##           master   manuel/upgrade-xcm-transactor      +/-   ##
=================================================================
+ Coverage   74.71%                          74.73%   +0.02%     
+ Files         397                             405       +8     
+ Lines       96483                           97981    +1498     
=================================================================
+ Hits        72085                           73219    +1134     
+ Misses      24398                           24762     +364     

Files Changed	Coverage
/pallets/xcm-transactor/src/encode.rs	68.87% (-31.13%)	🔽
/pallets/xcm-transactor/src/lib.rs	89.67% (+0.20%)	🔼
/pallets/xcm-transactor/src/mock.rs	66.48% (-3.52%)	🔽
/precompiles/gmp/src/mock.rs	31.78% (+2.61%)	🔼
/precompiles/relay-encoder/src/lib.rs	66.67% (+1.20%)	🔼
/precompiles/relay-encoder/src/mock.rs	39.13% (+1.99%)	🔼
/precompiles/relay-encoder/src/tests.rs	98.59% (+0.06%)	🔼
/precompiles/xcm-transactor/src/mock.rs	73.57% (-1.81%)	🔽
/precompiles/xtokens/src/mock.rs	63.70% (+0.21%)	🔼
/runtime/moonbase/src/genesis_config_preset.rs	71.77% (+1.56%)	🔼
/runtime/moonbase/src/xcm_config.rs	52.50% (-4.23%)	🔽
/runtime/moonbase/tests/xcm_mock/parachain.rs	71.78% (-0.20%)	🔽
/runtime/moonbeam/src/xcm_config.rs	52.03% (-1.18%)	🔽
/runtime/moonbeam/tests/xcm_mock/parachain.rs	71.78% (-0.20%)	🔽
/runtime/moonriver/src/xcm_config.rs	52.03% (-1.18%)	🔽
/runtime/moonriver/tests/xcm_mock/parachain.rs	72.95% (-0.24%)	🔽
/runtime/relay-encoder/src/westend.rs	99.14% (+0.02%)	🔼

Coverage generated Mon Nov 17 09:44:03 UTC 2025

[RomarQ]

Suggested change

	/// AssetHub system parachain (para 1000)
	/// AssetHub system parachain

[RomarQ]

On Moonbase Alpha, the AssetHub ParachainID is 1001

Suggested change

	interior: [Parachain(1000)].into(),
	interior: [Parachain(1001)].into(),