News355: add topics

Author: harding

_topics/en/payjoin.md

@@ -110,6 +110,9 @@ optech_mentions:
   - title: "Rust-payjoin 0.21.0 release adds transaction cut-through capabilities"
     url: /en/newsletters/2025/01/24/#rust-payjoin-0-21-0-released
 
+  - title: "Cake Wallet adds payjoin v2 support"
+    url: /en/newsletters/2025/05/23/#cake-wallet-added-payjoin-v2-support
+
 ## Optional.  Same format as "primary_sources" above
 see_also:
   - title: BIP79

_topics/en/peer-storage.md

@@ -42,6 +42,9 @@ optech_mentions:
   - title: "LDK #3575 implements the peer storage protocol"
     url: /en/newsletters/2025/02/21/#ldk-3575
 
+  - title: "Core Lightning #8140 enables peer storage of channel backups by default"
+    url: /en/newsletters/2025/05/23/#core-lightning-8140
+
 ## Optional.  Same format as "primary_sources" above
 # see_also:
 #   - title:

_topics/en/splicing.md

@@ -98,6 +98,9 @@ optech_mentions:
   - title: "LDK #3624 enables funding key rotation after successful channel splices"
     url: /en/newsletters/2025/03/14/#ldk-3624
 
+  - title: "Core Lightning #8021 finalizes splicing interoperability with Eclair"
+    url: /en/newsletters/2025/05/23/#core-lightning-8021
+
 ## Optional.  Same format as "primary_sources" above
 see_also:
   - title: Interactive transaction construction protocol