diff --git a/.custodian-brief.md b/.custodian-brief.md
index fbb6fce..c4b7758 100644
--- a/.custodian-brief.md
+++ b/.custodian-brief.md
@@ -2,11 +2,22 @@
 # Custodian Brief — shard-wiki
 
 **Domain:** whynot  
-**Last synced:** 2026-06-15 12:07 UTC  
+**Last synced:** 2026-06-15 15:18 UTC  
 **State Hub:** http://127.0.0.1:8000 *(adjust if running on a remote machine)*
 
 ## Active Workstreams
 
+### wiki-engine prep — reuse-surface registration, UC-catalog systematization, WikiEngineCoreArchitecture
+Progress: 0/6 done  |  workstream_id: `04a25a53-2169-41d4-88c0-5035a06e72ef`
+
+**Open tasks:**
+- · Confirm reuse-surface target & register shard-wiki on it  `603cef8d`
+- · Systematize the UseCaseCatalog around a reuse-surface capability structure  `d83d0f96`
+- · Surface capability gaps / suggestions to the reuse surface  `06b62406`
+- · INTENT amendment + ratified decision (additive engine = reference shard backend)  `1d0ef72b`
+- · Author spec/WikiEngineCoreArchitecture.md  `4712bbfe`
+- · Wire-up & close-out  `1c383414`
+
 ### second adapter — git-IS-store shard (contract validation on a new substrate)
 Progress: 0/3 done  |  workstream_id: `9e24eeb0-c0f0-41e6-a1ca-88d71e4139ea`