Add ERC-8004 trustless agent registry support with new Cargo feature, client integration, and wallet method

- Add erc8004 dependency to workspace and machi package
- Add "erc8004" Cargo feature (depends on wallet) and include in "full" feature set
- Export Erc8004Network and RegistrationFile types in prelude when erc8004 feature enabled
- Add WalletError::Erc8004 variant and erc8004() constructor for registry errors
- Add evm/erc8004.rs module (conditionally compiled)
- Add EvmWallet::erc8004_client() method to

Author: gitctrlx

Cargo.lock

@@ -19,6 +19,7 @@ async-trait = "0.1"
 base64 = "0.22"
 convert_case = "0.11.0"
 darling = "0.23.0"
+erc8004 = "0.2"
 futures = "0.3"
 kobe = { version = "0.4", default-features = false, features = ["std", "rand"] }
 kobe-eth = { version = "0.4", default-features = false, features = ["std", "rand"] }

Cargo.toml

@@ -18,16 +18,18 @@ a2a = ["ra2a"]
 mcp = ["rmcp"]
 wallet = ["kobe", "kobe-eth", "alloy"]
 x402 = ["wallet", "dep:x402-reqwest", "dep:x402-chain-eip155", "dep:x402-types", "dep:reqwest-middleware"]
+erc8004 = ["wallet", "dep:erc8004"]
 toolkit = []
 memory-sqlite = ["dep:rusqlite"]
 schema = ["dep:schemars"]
-full = ["openai", "ollama", "derive", "a2a", "mcp", "wallet", "x402", "toolkit", "memory-sqlite", "schema"]
+full = ["openai", "ollama", "derive", "a2a", "mcp", "wallet", "x402", "erc8004", "toolkit", "memory-sqlite", "schema"]
 
 [dependencies]
 alloy = { workspace = true, optional = true }
 async-stream.workspace = true
 async-trait.workspace = true
 base64.workspace = true
+erc8004 = { workspace = true, optional = true }
 futures.workspace = true
 kobe = { workspace = true, optional = true }
 kobe-eth = { workspace = true, optional = true }

machi/Cargo.toml

@@ -76,5 +76,7 @@ pub use crate::wallet::X402HttpClient;
 pub use crate::wallet::{
     DerivationStyle, DerivedAddress, EvmChain, EvmWallet, HdWallet, Wallet, WalletError,
 };
+#[cfg(feature = "erc8004")]
+pub use crate::wallet::{Erc8004Network, RegistrationFile};
 #[cfg(feature = "derive")]
 pub use machi_derive::tool;

machi/src/prelude.rs

@@ -35,6 +35,11 @@ pub enum WalletError {
     #[cfg(feature = "x402")]
     #[error("x402 payment error: {0}")]
     Payment(String),
+
+    /// ERC-8004 registry interaction error.
+    #[cfg(feature = "erc8004")]
+    #[error("ERC-8004 error: {0}")]
+    Erc8004(String),
 }
 
 impl WalletError {
@@ -74,6 +79,13 @@ impl WalletError {
     pub fn payment(msg: impl Into<String>) -> Self {
         Self::Payment(msg.into())
     }
+
+    /// Create an ERC-8004 registry error.
+    #[cfg(feature = "erc8004")]
+    #[must_use]
+    pub fn erc8004(msg: impl Into<String>) -> Self {
+        Self::Erc8004(msg.into())
+    }
 }
 
 impl From<WalletError> for crate::tool::ToolError {