Context
The research sidebar (ADR-0022) opened with five ungrouped links (claims ledger, experiments, objections register, evidence index, slips), then three labelled groups (case files, articles, reference). The experiments page was a disclosure whose arrow sat outside the column. The red-team pages live under /research/red-team/ but form their own section, so they were missing from the research tree and showed a sidebar of three pages. Every sidebar ended with the Topics block of ADR-0023: all eight hubs, with a dot on those that list the current page, which a reader had no way to read. On 2026-10-26 Stefan Coetzee asked for the sidebar to be restructured, then for groups that fold out one at a time; a mockup was rendered, clicked through and chosen.
Decision
Groups are an accordion. side() in scripts/site_chrome.py writes each group of site/nav.yml as <details class="mb-side-acc" name="mb-side"> with the group name as its <summary>. Details elements that share a name are exclusive, so opening one closes the others with no script; Chrome 120, Safari 17.2 and Firefox 130 support it, and an older browser lets several stay open. The group holding the current page is open on load, and its heading keeps the accent colour while closed. Inside a group a page's children are listed under it, so the experiments register and the abliteration probe sit together with no second disclosure.
The research sidebar in reading order. The research section's pages form six groups: Experiments, Case files, Articles, Red team, Registers, Reference. Groups stay out of the breadcrumbs, so every page keeps its trail (Research, Experiments, the probe). A side: key gives a page a different name in the sidebar (the experiments page reads "All experiments" under the Experiments heading).
The red team is included. A group with include: red-team lists the red-team section's overview (as "Overview") and its pages. SIDEBAR_HOST maps the red-team section to the research sidebar, so a red-team page shows the same tree with the Red team group open. The red-team section stays a section: its breadcrumbs, its door on the front page and its place in the menu do not change.
No topic list in the sidebars. The Topics block is removed from side(), from the docs sidebar of scripts/build_docs.py and from the styles, with its helpers. Topics stays in the top bar's More menu and on /topics/. The research sidebar's Reference group links it through a link: entry: a sidebar-only link, which is never indexed as a page of the section, so /topics/ keeps its own section and breadcrumbs.
The research index follows the groups. scripts/build_hubs.py lists the research index by the same groups: an included section's overview and pages, a page's children, and no sidebar-only links.
Consequences
A research or red-team page shows six headings and the one group the reader is in, instead of twelve links in mixed order and eight topic hubs. A reader moving between the research pages and the red team keeps one tree. A new research page needs a group in site/nav.yml; a page outside any group would sit above the groups as a plain link. The topic hubs no longer show which topics list the current page; a hub still lists its pages. The research index counts fifteen pages, the red-team pages included.