Add TLV field to hsmd_init_reply_v4 to communicate the HSM secret type (mnemonic vs legacy) from HSM to lightningd. This allows lightningd to automatically determine whether to use BIP86 or BIP32 derivation without needing separate address types.
Add TLV field to hsmd_init_reply_v4 to communicate the HSM secret type (mnemonic vs legacy) from HSM to lightningd. This allows lightningd to automatically determine whether to use BIP86 or BIP32 derivation without needing separate address types.