refactor: use TokenMetadata instead of raw Word manipulation in genesis config

- Import BlockSigner at top of config/mod.rs and simplify as_account_files signature
- Replace manual Word construction with TokenMetadata::try_from and with_token_supply
- Use TokenMetadata::token_supply() in tests instead of raw Word indexing

Co-authored-by: marti <marti@hungrycats.studio>

Author: cursoragent

crates/store/src/genesis/config/mod.rs

@@ -5,6 +5,7 @@ use std::str::FromStr;
 
 use indexmap::IndexMap;
 use miden_node_utils::crypto::get_rpo_random_coin;
+use miden_node_utils::signer::BlockSigner;
 use miden_protocol::account::auth::AuthSecretKey;
 use miden_protocol::account::{
     Account,
@@ -23,10 +24,10 @@ use miden_protocol::asset::{FungibleAsset, TokenSymbol};
 use miden_protocol::block::FeeParameters;
 use miden_protocol::crypto::dsa::falcon512_rpo::SecretKey as RpoSecretKey;
 use miden_protocol::errors::TokenSymbolError;
-use miden_protocol::{Felt, FieldElement, ONE, Word};
+use miden_protocol::{Felt, FieldElement, ONE};
 use miden_standards::AuthScheme;
 use miden_standards::account::auth::AuthFalcon512Rpo;
-use miden_standards::account::faucets::BasicFungibleFaucet;
+use miden_standards::account::faucets::{BasicFungibleFaucet, TokenMetadata};
 use miden_standards::account::wallets::create_basic_wallet;
 use rand::distr::weighted::Weight;
 use rand::{Rng, SeedableRng};
@@ -219,16 +220,13 @@ impl GenesisConfig {
             let mut storage_delta = AccountStorageDelta::default();
 
             if total_issuance != 0 {
-                let metadata_slot_name = BasicFungibleFaucet::metadata_slot();
-                let current_metadata =
-                    faucet_account.storage().get_item(metadata_slot_name).unwrap();
-                let updated_metadata = Word::from([
-                    Felt::new(total_issuance),
-                    current_metadata[1],
-                    current_metadata[2],
-                    current_metadata[3],
-                ]);
-                storage_delta.set_item(metadata_slot_name.clone(), updated_metadata)?;
+                let current_metadata = TokenMetadata::try_from(faucet_account.storage())?;
+                let updated_metadata =
+                    current_metadata.with_token_supply(Felt::new(total_issuance))?;
+                storage_delta.set_item(
+                    TokenMetadata::metadata_slot().clone(),
+                    updated_metadata.into(),
+                )?;
                 tracing::debug!(
                     "Reducing faucet account {faucet} for {symbol} by {amount}",
                     faucet = faucet_id.to_hex(),
@@ -448,7 +446,7 @@ impl AccountSecrets {
     /// and the index in
     pub fn as_account_files(
         &self,
-        genesis_state: &GenesisState<impl miden_node_utils::signer::BlockSigner>,
+        genesis_state: &GenesisState<impl BlockSigner>,
     ) -> impl Iterator<Item = Result<AccountFileWithName, GenesisConfigError>> + '_ {
         let account_lut = IndexMap::<AccountId, Account>::from_iter(
             genesis_state.accounts.iter().map(|account| (account.id(), account.clone())),

crates/store/src/genesis/config/tests.rs

@@ -44,11 +44,8 @@ fn parsing_yields_expected_default_values() -> TestResult {
     });
 
     // check total issuance of the faucet
-    assert_eq!(
-        native_faucet.storage().get_item(BasicFungibleFaucet::metadata_slot()).unwrap()[0],
-        Felt::new(999_777),
-        "Issuance mismatch"
-    );
+    let metadata = TokenMetadata::try_from(native_faucet.storage()).unwrap();
+    assert_eq!(metadata.token_supply(), Felt::new(999_777), "Issuance mismatch");
 
     Ok(())
 }