diff --git a/.custodian-brief.md b/.custodian-brief.md
index 843ccd1..1a1630c 100644
--- a/.custodian-brief.md
+++ b/.custodian-brief.md
@@ -2,11 +2,24 @@
 # Custodian Brief — shard-wiki
 
 **Domain:** whynot  
-**Last synced:** 2026-06-08 10:24 UTC  
+**Last synced:** 2026-06-08 12:55 UTC  
 **State Hub:** http://127.0.0.1:8000 *(adjust if running on a remote machine)*
 
 ## Active Workstreams
 
+### federation architecture design
+Progress: 0/10 done  |  workstream_id: `2af4c46d-cbfd-40ea-a94b-d9e60b0f9945`
+
+**Open tasks:**
+- · Architecture positioning and boundaries  `ea8fdb22`
+- · Remix primitives: fork, overlay, import, reference  `fb7d4bce`
+- · Equivalent page identity and multi-version presentation  `8f2a333d`
+- · History, attribution, and coordination journal  `5f39f48d`
+- · Union composition layer  `3ff71e11`
+- · Change notification and subscription transports  `9596e5e8`
+- · Information space lifecycle  `38134064`
+- … and 3 more open tasks
+
 ### shard-wiki requirements from yawex prior art
 Progress: 0/6 done  |  workstream_id: `0ed023a2-760b-4990-b931-8ee1f41ea08f`