design: test-email - a Test message card on Health

Decided by the owner on 2026-10-13 (out of preflight), taken up on
2026-10-16; the sender is the owner's choice of 2026-10-16 ("Да, адрес
годится"): postmaster@ the hostname, as notifications. Server › Health
gets card 09, Test message: one recipient and Send. The message goes as
notifications go - through Postfix, signed with the key of the server's
own name - and opens in the Outbound log, whose page follows it to the
receiving server; ten an hour. The help gets a Test message topic: what
the test proves (the server's path, not a domain's) and what it does not
(the inbox). outlines.json: health gains the box, help one topic.
check.py: 0 violations.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs/assets/panel-redesign/panel/outlines.json

@@ -82,7 +82,8 @@
       "box[Processes]:table",
       "box[Sender check]:table+body",
       "box[Hostname and reverse DNS]:body",
-      "box[Machine]:table"
+      "box[Machine]:table",
+      "box[Test message]:body"
      ]
     },
     {
@@ -107,7 +108,7 @@
     },
     {
      "is-9": [
-      "box[Overview]:help×3",
+      "box[Overview]:help×4",
       "box[Outbound]:help×7",
       "box[Inbound]:help×6",
       "box[Server]:help×4",