diff --git a/documentation/architecture/09-update-architecture.md b/documentation/architecture/09-update-architecture.md
index 477ccf46..6d850f0a 100644
--- a/documentation/architecture/09-update-architecture.md
+++ b/documentation/architecture/09-update-architecture.md
@@ -915,6 +915,15 @@ its length, and both fixes cost something the household would notice — operato
 127. **The agent's three by-design abilities (`03` §3.1) stay for now**; revisited before the first paying customer.
      *Operator ruling 2026-10-05.* (R-861)
 
+### 2026-10-07 (evening) — operator rulings on the first kernel night (recorded before the work)
+
+174. **The household kernel mail text stays as written**, plus a reply address (a `Reply-To` that reaches the operator).
+     *Operator ruling 2026-10-07 evening.* (R-836)
+175. **The mail window 09:00–20:00 and at most 3 mails per kernel: keep.** *Operator ruling 2026-10-07 evening.*
+176. **The three pre-night fixes run TODAY (2026-10-07), and both demo boxes take their kernel step THIS night (7→8)** —
+     the brief said 2026-10-08; asked at 18:34, the operator answered *"Start today, and do both boxes this night."*
+     The read-back moves to the morning of 2026-10-08. *Operator ruling 2026-10-07 18:35.*
+
 ### 2026-10-07 (14:43) — operator rulings on the kernel lane and R-32 (recorded before the work)
 
 172. **The kernel lane: yes — design option A (the one-shot flag on the ESP), with option C on the one-shot entry**