News401: add topics

Author: bitschmidty

_topics/en/psbt.md

@@ -243,6 +243,9 @@ optech_mentions:
   - title: "Extensions to tooling, including PSBTs, for TEMPLATEHASH-CSFS-IK support"
     url: /en/newsletters/2026/03/06/#extensions-to-standard-tooling-for-templatehash-csfs-ik-support
 
+  - title: "BIPs #2089 publishes BIP376, defining new PSBTv2 fields for BIP352 tweak data"
+    url: /en/newsletters/2026/04/17/#bips-2089
+
 ## Optional.  Same format as "primary_sources" above
 see_also:
   - title: Output Script Descriptors

_topics/en/silent-payments.md

@@ -98,6 +98,9 @@ optech_mentions:
   - title: "BIPs #2047 publishes BIP392, defining a descriptor format for silent payments"
     url: /en/newsletters/2026/03/13/#bips-2047
 
+  - title: "BIPs #2089 publishes BIP376, defining new PSBTv2 fields for BIP352 tweak data"
+    url: /en/newsletters/2026/04/17/#bips-2089
+
 ## Optional.  Same format as "primary_sources" above
 see_also:
   - title: Output linking

_topics/en/simple-taproot-channels.md

@@ -62,6 +62,9 @@ optech_mentions:
   - title: "Eclair #3103 adds support for simple taproot channels"
     url: /en/newsletters/2025/08/22/#eclair-3103
 
+  - title: "LND #9985 adds end-to-end support for production simple taproot channels"
+    url: /en/newsletters/2026/04/17/#lnd-9985
+
 ## Optional.  Same format as "primary_sources" above
 see_also:
   - title: Taproot

_topics/en/v3-commitments.md

@@ -38,6 +38,9 @@ optech_mentions:
   - title: "LDK #3792 introduces initial support for v3 commitment transactions"
     url: /en/newsletters/2025/06/13/#ldk-3792
 
+  - title: "LDK #4515 switches the zero-fee commitment channel feature bit to production"
+    url: /en/newsletters/2026/04/17/#ldk-4515
+
 ## Optional.  Same format as "primary_sources" above
 see_also:
   - title: Channel commitment upgrades