diff --git a/.custodian-brief.md b/.custodian-brief.md
index 3cfa445..fbb6fce 100644
--- a/.custodian-brief.md
+++ b/.custodian-brief.md
@@ -2,12 +2,46 @@
 # Custodian Brief — shard-wiki
 
 **Domain:** whynot  
-**Last synced:** 2026-06-15 11:47 UTC  
+**Last synced:** 2026-06-15 12:07 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)*
+### second adapter — git-IS-store shard (contract validation on a new substrate)
+Progress: 0/3 done  |  workstream_id: `9e24eeb0-c0f0-41e6-a1ca-88d71e4139ea`
+
+**Open tasks:**
+- · GitShardAdapter — read over a git working tree/repo  `8a1c7c80`
+- · Write = commit; current_rev = sha (drift)  `b47dfb86`
+- · History adopt + integration with union/overlay  `4c895f42`
+
+### incremental union maintenance + equivalence index + I-2 verification
+Progress: 0/4 done  |  workstream_id: `78d48bcf-6482-4266-bc81-084b7ec1cd80`
+
+**Open tasks:**
+- · Equivalence index: blocking + verify  `842f480b`
+- · Incremental maintenance (delta, not additive)  `2da4e0b8`
+- · I-2 verification: digest + consistency-checker  `b602ce31`
+- · Wire incremental tier behind resolution + views  `2f3d083c`
+
+### derived views — wikilinks, BackLinks, RecentChanges, AllPages/SiteMap
+Progress: 0/5 done  |  workstream_id: `2fe15330-ddf6-4b0f-8e55-ada341375d35`
+
+**Open tasks:**
+- · Wikilink + red-link model  `792660c3`
+- · BackLinks (core)  `431a54c3`
+- · RecentChanges (core)  `270c1c31`
+- · AllPages / SiteMap (core)  `898ba43e`
+- · Wiring + integration  `7157544b`
+
+### git-backed DecisionLog + per-space append authority
+Progress: 0/4 done  |  workstream_id: `4fb5b29b-955c-4f37-85cf-58b4643ab1ca`
+
+**Open tasks:**
+- · Git event-store backend (append = commit/object)  `a8fcbb3e`
+- · Per-space append authority (lease)  `62abd162`
+- · Fold over the git log + read-your-writes across processes  `8cc3691e`
+- · Migration + wiring  `281e1db4`
 
 ---
 ## MCP Orientation (when available)