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

workplans/RBT-WP-0004-local-runbook-ui.md

@@ -214,6 +214,21 @@ views on a mid-run state). Three views of one run:
 - **Visual design**: a restrained stylesheet (hairlines, state pills that never rely on colour alone, highlighter accent for
   the recommended action, print rules). Dark theme is written but not verified in a browser.
 
+## Feedback round after the first v0.2 hands-on (2026-09-29)
+
+```task
+id: RBT-WP-0004-T14
+status: done
+priority: high
+```
+
+Bernd's remarks, each handled and tested: (a) forms no longer ask for a name; the active user (`user-attributes`, app-level and reusable by
+projects; `RTUT_USER`, saved settings or the OS login; `/user` page); (b) the showcase's irreversible step is now genuinely irreversible (the
+logbook entry carries the exact time it was written); (c) a "Latest activities" section on the main page; (d) values that steps already used
+can only be changed with an override and are recorded as `changed-after-use`, saves are all-or-nothing; (e) artefacts on the Data tab can be
+opened and downloaded, with safety rules; (f) run start, finish and duration, per-step duration, and the average duration of successful
+runs next to the score. Documented in `docs/run-spec.md` and `docs/maturity-and-projects.md`.
+
 ## Acceptance Criteria
 
 - Bernd can complete the SSH tutorial pack in the UI without pasting outputs to an agent.