Design 39 bus-and-switch: the lead's answers B38 and B39 met in develop

Claude-Session: https://claude.ai/code/session_01NcbgfHb9d4T9nq5Q6WqdiJ
2026-11-12 00:08:17 +01:00
parent 044cd2dfdd
commit e65c0ea27f
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@@ -515,3 +515,9 @@ written; they are cited as "design 39 bus-and-switch B*n*".
 - **B36** (both windows at the threshold): the act names the higher, the session window on a tie (P7).
 - **B37** (a setting outside its bound): it keeps its default and raises `settings.<setting>.invalid`, cleared when the
  setting is fixed (P3).
+- **B38** (a subscription never read successfully since its adoption): `usage-unread` is raised once no reading has
+  succeeded for `usage_stale_minutes` counted from its adoption (P3).
+- **B39** (a condition's headline longer than the operator channel's 60 characters): the headline names counts and
+  short names only ("No licence has room for 4 machines", "<account> at 99% weekly"); the full list, the licence and
+  the reset time go in the condition's detail. A cut at 60 characters with "…" stays as the last guard so a condition is
+  never refused unsaid (P3).