docs: rulings 2026-10-04 ~12:20 (decisions 81-83); R-842 closed (A); R-840 ruling recorded

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_0159rPz1ZhFKsS53msqPYxtS
2026-10-04 12:24:07 +02:00
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@@ -765,6 +765,19 @@ its length, and both fixes cost something the household would notice — operato
 80. **Next build: the guest fast lane** (`11` §8 step 2), with R-837 (the snapshot undo) measured first and R-838 (the
    infrastructure images) in the same session. *Operator ruling 2026-10-04 ~10:17.*

+### 2026-10-04 (~12:20) — three operator rulings (recorded before the work)
+
+81. **The undo for a failed OS update is the whole-guest backup, restored by hand (R-842, option A).** Nothing new is
+    built. **Rejected:** a home-made LVM-thin snapshot behind Proxmox's back (unmeasured; thin-pool risk).
+    *Operator ruling 2026-10-04 ~12:20.*
+82. **R-840 (a route for wrappers/sudoers to installed boxes) is not built now** — *"There are no older boxes."* No
+    installed box exists outside the two demo boxes, and they take wrapper changes by hand. The row stays open, not
+    re-ranked. *Reviewer's note, recorded as written:* the ruling is right for today, but every box installed from now on
+    becomes an "older box" the first time the wrapper or the sudoers line changes again; R-840 must be solved before the
+    first box that cannot be reached by hand. *Operator ruling 2026-10-04 ~12:20.*
+83. **Next: the tunnel status (R-841), the host fast lane (`11` §8 step 3), and other OS-update improvements.**
+    *Operator ruling 2026-10-04 ~12:20.*
+
 ### 2026-09-30 (day) — operator notes, recorded before the work

 - **The day brief runs by day.** Every backup and automatic-update test is started by hand — the night chain's debug