runbooks: the migration is complete — mark it as history, not pending work

The cutover finished 2026-11-02 and this repo is public and read by members, so leaving a plan that reads like outstanding work is actively misleading. A dated banner now says it is complete and retained as the record; the STATE OF PLAY section is re-labelled as pre-cutover and marked superseded, with the one part known to be wrong (Listmonk's mail path, which moved to Scaleway TEM) named rather than silently corrected; and both files point at where live knowledge now lives — the cloudron-ops skill for procedure and co-op/docs/infrastructure.md for the member-facing description.

cloudron-server-migration.md

@@ -1,5 +1,20 @@
 # Cloudron server migration — Hostinger → Infomaniak
 
+> **COMPLETED 2026-11-02.** The migration is done: the co-op's services run on the new
+> Infomaniak box, every hostname resolves there, 16 apps verified against the pre-migration
+> baseline, and members were notified before and after the window.
+>
+> **This document is now HISTORY — retained deliberately, not pending work.** It is the record of
+> how the move was planned and carried out, and it is worth keeping for the next one. Read it for
+> what was learned, not for current state. Two things went stale the moment the cutover finished:
+> anything marked "to do" below, and the mail architecture (see the note further down).
+>
+> **Where the live knowledge lives now:** the `cloudron-ops` skill for operational procedure, and
+> `co-op/docs/infrastructure.md` for the member-facing description. Those two are maintained; this
+> file is not.
+
+---
+
 Pre-flight and cutover runbook for moving the co-op's Cloudron server. Written
 2026-10-29 from a live inventory of the server; revised 2026-10-30 after a read-only
 review against live DNS, federation and backup state. **Owner:** Nathan. **Executor:**
@@ -367,9 +382,13 @@ by pre-cutover DNS plus port 25 — the point is that no *unexplained* failure a
 
 ---
 
-# STATE OF PLAY — 2026-11-02 (read this first)
+# STATE OF PLAY — 2026-11-02 (AS IT WAS BEFORE THE CUTOVER — superseded)
 
-Written for whoever picks this up next, including a fresh agent session with none of the history.
+Written before the cutover for whoever picked it up next, including a fresh agent session with none of
+the history. It is kept verbatim because it shows what was believed at the time and what turned out to
+matter. **One thing below is now wrong on purpose-left-alone grounds: mail.** Listmonk has since moved to
+Scaleway TEM (`smtp.tem.scaleway.com`, username = the DKIM selector UUID) — see the `cloudron-ops` skill
+for the current arrangement rather than trusting this section.
 
 ## Mail: receiving on the box, sending through a relay