News349: add topics

Author: harding

_topics/en/assumeutxo.md

@@ -73,6 +73,9 @@ optech_mentions:
   - title: "Bitcoin Core #30807 has assumeUTXO nodes during background sync signal NODE_NETWORK_LIMITED"
     url: /en/newsletters/2024/09/20/#bitcoin-core-30807
 
+  - title: "SwiftSync faster syncs compatible and complementary with assumeUTXO"
+    url: /en/newsletters/2025/04/11/#swiftsync-speedup-for-initial-block-download
+
 ## Optional.  Same format as "primary_sources" above
 see_also:
   - title: "Bitcoin Core issue #15605: AssumeUTXO discussion"

_topics/en/fee-estimation.md

@@ -62,6 +62,9 @@ optech_mentions:
   - title: "Updated LND sweeper subsystem using multiple feerate estimation methods"
     url: /en/newsletters/2025/03/21/#discussion-of-lnd-s-dynamic-feerate-adjustment-system
 
+  - title: "PR Review Club about improved feerate forecasting for Bitcoin Core"
+    url: /en/newsletters/2025/04/11/#bitcoin-core-pr-review-club
+
 ## Optional.  Same format as "primary_sources" above
 see_also:
   - title: Coin selection

_topics/en/simple-taproot-channels.md

@@ -56,6 +56,9 @@ optech_mentions:
   - title: "Eclair #3026 adds support for wallets containing P2TR addresses in preparation for taproot channels"
     url: /en/newsletters/2025/03/28/#eclair-3026
 
+  - title: "LND #9669 downgrades simple taproot channels to always use the legacy cooperative close flow"
+    url: /en/newsletters/2025/04/11/#lnd-9669
+
 ## Optional.  Same format as "primary_sources" above
 see_also:
   - title: Taproot

_topics/en/utreexo.md

@@ -49,6 +49,9 @@ optech_mentions:
   - title: "Utreexo might make it easier to manage a DAG-style blockchain"
     url: /en/newsletters/2025/02/07/#fast-difficulty-adjustment-algorithm-for-a-dag-blockchain
 
+  - title: "SwiftSync faster sync allows parallel block validation, similar to Utreexo"
+    url: /en/newsletters/2025/04/11/#swiftsync-speedup-for-initial-block-download
+
 ## Optional.  Same format as "primary_sources" above
 see_also:
   - title: Uneconomical outputs