Active user attribute set, latest activities, guarded changes to used values, artefact links, durations and averages; irreversible showcase step

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

Assistant: claude-code
Assistant-Model: sonnet
Assistant-Process: 295952@bnt-lap001
Assistant-Session: e93f64ad-516c-46eb-9666-aad8d300c477

runbooks/showcase-lighthouse/pack.yaml

@@ -67,7 +67,7 @@ steps:
     title: Write tonight's entry in the logbook
     owner: the-lighthouse
     description: The only step that changes anything, and only a file under /tmp/rtut-. Reversible, so it needs a confirm, not a typed phrase.
-    command: mkdir -p {{logdir}} && echo "Night watch by {{keeper}} - {{weather}}, {{lamp}} lamp, signal {{signal}}. {{motto}}." >> {{logdir}}/logbook.txt
+    command: mkdir -p {{logdir}} && echo "Night watch by {{keeper}} at $(date -u +%H:%M:%S) UTC - {{weather}}, {{lamp}} lamp, signal {{signal}}. {{motto}}." >> {{logdir}}/logbook.txt
     risk: changes-state
     rollback: rm -rf {{logdir}}
     verify:
@@ -87,10 +87,10 @@ steps:
   - id: dawn
     title: Put out the lamp and tidy up
     owner: the-lighthouse
-    description: Removes the scratch folder. A run in which every step is done can offer to mark this pack exercised.
+    description: Removes the scratch folder. The entry carries the exact time it was written, so once it is gone it cannot be written again the same way.
     command: rm -rf {{logdir}}
-    risk: changes-state
-    rollback: Repeat write-the-logbook to rebuild the entry.
+    risk: destructive
+    rollback: Not reversible. The logbook entry contains the exact time it was written, which cannot be reproduced.
     verify:
       done_when: The scratch folder is gone
       command: test ! -e {{logdir}}