Document the test suite in the command and setup docs.

`package.json` has had a `test` script since the interior-polish work landed,
and 12 files under `server/__tests__/` now guard hall geometry, clearance,
brightness, window styles and the movement-links validators. Nothing outside
`data-and-images.md` said the suite existed, and no document said how to run
it — despite Bible.md requiring tests to be written before the code.

FAC.md gains a Tests section between Verify and Build frontend: the command,
what the suite covers by area, and the two properties that make it cheap to
run — no test framework (Node's built-in runner) and no database or server,
since the tests read the client's style and geometry modules from disk.

setup.md lists `npm test` first in the Run table and notes on the Node
prerequisite that the script depends on `node --test` expanding `**` itself.
README.md gets the command beside the dev-server ones, and the interiors
section of data-and-images.md now points at the suite that enforces its rules.

Docs only; no source changes. Verified by running the suite (15 suites, 41
tests, all passing) and by confirming from PowerShell — which does not expand
globs — that the runner does its own pattern matching.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

Documentation/setup.md

@@ -2,7 +2,7 @@
 
 ## Prerequisites
 
-- **Node.js** 20+
+- **Node.js** 20+ (verified on 24.19; `npm test` relies on `node --test` expanding `**` itself, which older majors may not do)
 - **PostgreSQL** reachable from the app host
 - Network access to Wikipedia / Wikimedia (for biographies, seeding, and on-demand image fetch)
 
@@ -107,6 +107,7 @@ Image fetch can take hours if you run it for the entire catalog. The first line
 
 | Command | Purpose |
 |---------|---------|
+| `npm test` | **Test suite** — 15 suites / 41 tests on Node’s built-in runner; no database or server needed |
 | `npm run dev:web` | **Public dev stack** — Vite `:5173`, API `:3451` (Keenetic → devgallery…) |
 | `npm run prod:docker:publish` | Build + push prod image to Gitea |
 | `npm run devtoprod:images` | Copy `data/images/` → TrueNAS via SMB `Gallery` share |