Move is_op_return and new_op_return to primitives

diff --git a/bitcoin/src/bip158.rs b/bitcoin/src/bip158.rs
index 8a2b515b..4731f155 100644
--- a/bitcoin/src/bip158.rs
+++ b/bitcoin/src/bip158.rs
@@ -46,7 +46,7 @@ use io::{BufRead, Write};
 use crate::block::{Block, BlockHash, Checked};
 use crate::encoding::{CompactSizeEncoder, CompactSizeU64Decoder, ExactSizeEncoder as _};
 use crate::prelude::{BTreeSet, Borrow, Vec};
-use crate::script::{ScriptPubKey, ScriptPubKeyExt as _};
+use crate::script::ScriptPubKey;
 use crate::transaction::OutPoint;
 use crate::ToU64 as _;
 
diff --git a/bitcoin/src/blockdata/script/borrowed.rs b/bitcoin/src/blockdata/script/borrowed.rs
index 84cf2b67..f3ee64c3 100644
--- a/bitcoin/src/blockdata/script/borrowed.rs
+++ b/bitcoin/src/blockdata/script/borrowed.rs
@@ -287,15 +287,6 @@ internal_macros::define_extension_trait! {
                 && self.as_bytes()[1] == OP_PUSHBYTES_32.to_u8()
         }
 
-        /// Check if this is a consensus-valid OP_RETURN output.
-        ///
-        /// To validate if the OP_RETURN obeys Bitcoin Core's current standardness policy, use
-        /// [`is_standard_op_return()`](Self::is_standard_op_return) instead.
-        #[inline]
-        fn is_op_return(&self) -> bool {
-            self.as_bytes().first().is_some_and(|&b| b == OP_RETURN.to_u8())
-        }
-
         /// Check if this is an OP_RETURN that obeys Bitcoin Core standardness policy.
         ///
         /// What this function considers to be standard may change without warning pending Bitcoin Core
diff --git a/bitcoin/src/blockdata/script/owned.rs b/bitcoin/src/blockdata/script/owned.rs
index ffd5a297..a31c22a4 100644
--- a/bitcoin/src/blockdata/script/owned.rs
+++ b/bitcoin/src/blockdata/script/owned.rs
@@ -126,11 +126,6 @@ internal_macros::define_extension_trait! {
 crate::internal_macros::define_extension_trait! {
     /// Extension functionality for the [`ScriptPubKeyBuf`] type.
     pub trait ScriptPubKeyBufExt impl for ScriptPubKeyBuf {
-        /// Generates OP_RETURN-type of scriptPubkey for the given data.
-        fn new_op_return<T: AsRef<PushBytes>>(data: T) -> Self {
-            Builder::new().push_opcode(OP_RETURN).push_slice(data).into_script()
-        }
-
         /// Generates P2PK-type of scriptPubkey.
         fn new_p2pk(pubkey: LegacyPublicKey) -> Self {
             Builder::new().push_key(pubkey).push_opcode(OP_CHECKSIG).into_script()
diff --git a/primitives/src/script/borrowed.rs b/primitives/src/script/borrowed.rs
index 851e8093..32453c48 100644
--- a/primitives/src/script/borrowed.rs
+++ b/primitives/src/script/borrowed.rs
@@ -13,7 +13,7 @@ use arbitrary::{Arbitrary, Unstructured};
 use encoding::{BytesEncoder, CompactSizeEncoder, Encode, Encoder2};
 
 use super::{ScriptBuf, P2A_PROGRAM};
-use crate::opcodes::all::{OP_CHECKSIG, OP_DUP, OP_EQUAL, OP_EQUALVERIFY, OP_HASH160};
+use crate::opcodes::all::{OP_CHECKSIG, OP_DUP, OP_EQUAL, OP_EQUALVERIFY, OP_HASH160, OP_RETURN};
 use crate::opcodes::{Opcode, OP_PUSHBYTES_2, OP_PUSHBYTES_20, OP_PUSHBYTES_32};
 use crate::prelude::{Box, ToOwned, Vec};
 use crate::script::ScriptHashableTag;
@@ -278,6 +278,15 @@ impl ScriptPubKey {
             && self.as_bytes()[1] == OP_PUSHBYTES_2.to_u8()
             && self.as_bytes()[2..] == P2A_PROGRAM
     }
+
+    /// Check if this is a consensus-valid `OP_RETURN` output.
+    ///
+    /// To validate if the `OP_RETURN` obeys Bitcoin Core's current standardness policy, use
+    /// `bitcoin::ScriptPubKeyExt::is_standard_op_return()` instead.
+    #[inline]
+    pub fn is_op_return(&self) -> bool {
+        self.as_bytes().first().is_some_and(|&b| b == OP_RETURN.to_u8())
+    }
 }
 
 impl<T> Encode for Script<T> {
diff --git a/primitives/src/script/owned.rs b/primitives/src/script/owned.rs
index 0ae94588..1388dbc7 100644
--- a/primitives/src/script/owned.rs
+++ b/primitives/src/script/owned.rs
@@ -8,7 +8,7 @@ use arbitrary::{Arbitrary, Unstructured};
 use encoding::{ByteVecDecoder, DecoderStatus};
 
 use super::{Script, ScriptBufDecoderError, P2A_PROGRAM};
-use crate::opcodes::all::{OP_1, OP_1NEGATE, OP_EQUAL, OP_HASH160};
+use crate::opcodes::all::{OP_1, OP_1NEGATE, OP_EQUAL, OP_HASH160, OP_RETURN};
 use crate::opcodes::{self, Opcode};
 use crate::prelude::{Box, Vec};
 use crate::script::{Builder, PushBytes, ScriptHash, WScriptHash};
@@ -261,6 +261,11 @@ impl<T> ScriptBuf<T> {
 }
 
 impl ScriptPubKeyBuf {
+    /// Generates OP_RETURN-type of scriptPubkey for the given data.
+    pub fn new_op_return<T: AsRef<PushBytes>>(data: T) -> Self {
+        Builder::new().push_opcode(OP_RETURN).push_slice(data).into_script()
+    }
+
     /// Generates P2SH-type of scriptPubkey with a given hash of the redeem script.
     pub fn new_p2sh(script_hash: ScriptHash) -> Self {
         Builder::new()