085: The page for publishers, kept current, with a version history of its own

What is asked

1. /publishers/ is the page Dinis will send to publishers. It was written once on sgit.ai on 11 October and imported unchanged; a week of the newsroom's most important features for a publisher is missing from it. Bring it up to date.
2. Keep it up to date without anyone remembering to: the parts that go stale (what is live, the newest pieces, the five to start with) come from the data the publishers' section already uses.
3. A version history for the page alone: every version of its text kept, what changed between them, and what changed in its live parts, release by release.

Scenario

Given the features register gains an entry for publishers in a release
When the release is built
Then /publishers/ lists it in What is live today, with when it shipped
And publishers/changes.json and the versions page record that release as adding it

Given someone edits admin/content/publishers/page.md
When publishers.py runs and versions.json has no new version for the edit
Then the build stops, names the next version and gives the hash to record

Given a new version of the text is recorded
When the release is built
Then publishers/versions/<version>.md is written once and never rewritten
And the versions page shows what changed from the version before, block by block and word by word

Mock-up

The page as before, in the newsroom's look, with a status line under the first paragraph: "This page: v2.0.0, 18 Oct 2026, every version and what changed. Built with newsroom.sgit.ai v0.12.113: 193 articles, 20 features a publisher can use today." The versions page: a table of versions (date, release, words, changes), each change as the blocks that changed with deletions struck and additions underlined, and a list of releases in which the live parts changed.

Outcome

Shipped in v0.12.113. publishers/ is no longer imported (sync_newsroom.py: out of MOVED_DIRS, links to it from imported pages stay local through OWNED_HERE; its six files out of the sync record). admin/build/publishers.py builds publishers/index.html and index.md from admin/content/publishers/page.md and the site's data; admin/build/page_versions.py is the version history, written for any page: admin/content/publishers/versions.json, publishers/versions/v1.0.0.md (the 11 October text, frozen from the imported twin) and v2.0.0.md, publishers/changes.json, publishers/versions/index.html. Five features added to the register (Ask the site, Who is speaking, Sections by audience, The briefs, A version history for a page). Left: a version history for the other pages this site writes (the section, the front page's words) by the same module; screenshots of the page's features as they are now.