diff --git a/.custodian-brief.md b/.custodian-brief.md
index 30e8f1a..90b5e32 100644
--- a/.custodian-brief.md
+++ b/.custodian-brief.md
@@ -1,18 +1,19 @@
 <!-- custodian-brief: generated by fix-consistency — do not edit manually -->
 # Custodian Brief — activity-core
 
-**Domain:** (unknown)  
-**Last synced:** 2026-04-20 10:25 UTC  
+**Domain:** custodian  
+**Last synced:** 2026-04-20 10:40 UTC  
 **State Hub:** http://127.0.0.1:8000 *(adjust if running on a remote machine)*
 
 ## Active Workstreams
 
-*(none — repo may need first-session setup)*
+### activity-core Foundation — Temporal Backbone
+Progress: 21/21 done  |  workstream_id: `e22516cc-4fdf-4dad-a928-a9e04a9fa7c7`
 
 ---
 ## MCP Orientation (when available)
 
 If the state-hub MCP server is reachable, call:
-`get_domain_summary("")`
+`get_domain_summary("custodian")`
 This provides richer cross-domain context.
 If the MCP call fails, use this file as your orientation source.