fix: link memo

app/Services/MnemonicAddressLinker.php

@@ -10,7 +10,7 @@ use InvalidArgumentException;
 
 class MnemonicAddressLinker
 {
-    public const MAX_DERIVE_INDEX = 4;
+    public const MAX_DERIVE_INDEX = 9;
 
     public function __construct(
         private readonly ChainManager $chains,
@@ -18,7 +18,7 @@ class MnemonicAddressLinker
     ) {}
 
     /**
-     * Link a single address to a device mnemonic when BIP44 index 0..4 matches.
+     * Link a single address to a device mnemonic when BIP44 index 0..9 matches.
      */
     public function linkAddress(WalletAddress $address): bool
     {
@@ -149,7 +149,7 @@ class MnemonicAddressLinker
 
     /**
      * Backfill: for every mnemonic, link still-unlinked addresses on the same device
-     * when BIP44 index 0..4 matches.
+     * when BIP44 index 0..9 matches.
      *
      * @return array{mnemonics: int, linked: int}
      */