diff --git a/.custodian-brief.md b/.custodian-brief.md
index 1ac99a5..1785da8 100644
--- a/.custodian-brief.md
+++ b/.custodian-brief.md
@@ -2,11 +2,22 @@
 # Custodian Brief — shard-wiki
 
 **Domain:** whynot  
-**Last synced:** 2026-06-15 21:05 UTC  
+**Last synced:** 2026-06-15 21:52 UTC  
 **State Hub:** http://127.0.0.1:8000 *(adjust if running on a remote machine)*
 
 ## Active Workstreams
 
+### wiki-engine implementation — kernel + typed-extension runtime + activation
+Progress: 0/6 done  |  workstream_id: `bfce1644-d93d-44c7-af2c-6b0cb50cedd4`
+
+**Open tasks:**
+- · Engine kernel skeleton  `e81ba881`
+- · Typed-extension runtime  `8ae8e58a`
+- · Per-shard activation (feature-control / OpenFeature)  `c4fe9df4`
+- · Capability profile derived from active extensions (E-5)  `15fc8db7`
+- · EngineShardAdapter (engine as a canonical-mode shard)  `2fbf498c`
+- · First built-in extension (prove the framework end-to-end)  `b88d1640`
+
 ### second adapter — git-IS-store shard (contract validation on a new substrate)
 Progress: 0/3 done  |  workstream_id: `9e24eeb0-c0f0-41e6-a1ca-88d71e4139ea`