diff --git a/.custodian-brief.md b/.custodian-brief.md
index 50c19eb..86c022d 100644
--- a/.custodian-brief.md
+++ b/.custodian-brief.md
@@ -2,11 +2,24 @@
 # Custodian Brief — test-driver
 
 **Domain:** infotech  
-**Last synced:** 2026-08-22 20:41 UTC  
+**Last synced:** 2026-08-22 21:11 UTC  
 **State Hub:** http://127.0.0.1:8000 *(adjust if running on a remote machine)*
 
 ## Active Workstreams
 
+### Vertical spike: falsify the crystallization thesis
+Progress: 2/10 done  |  workplan_id: `68b252b8-03e7-55c7-8dec-ac13f6ca0aa1`
+
+**Open tasks:**
+- · Minimal research control plane  `31b88522`
+- · Deterministic semantic kernel  `ffbcc9e8`
+- · Test-driver lab with labelled ground truth  `595a89c2`
+- · Out-of-band ground truth for self-verification  `4fb31485`
+- · Agentic realisation of one semantic action, fully instrumented  `b58cf7ce`
+- · Adaptation detection and the defect-vs-adaptation classifier  `e2403d3c`
+- · Crystallize one asset into deterministic regression  `855a1f41`
+- … and 1 more open tasks
+
 ### Bootstrap State Hub integration
 Progress: 2/3 done  |  workplan_id: `a8573acc-44b5-5364-b0e3-6797c3e2e426`