docs(design): Fjord stays a fifth scheme beside Midnight

The trial is over: the owner kept it. The trial wording goes from the
tokens, the scheme list, the lab and DESIGN; B2's own-hue rule still
binds any new scheme.

frontend/src/design-lab/batchB.tsx

@@ -89,7 +89,7 @@ const SCHEMES: SchemeDef[] = [
     light: pal("#f4f5f0", "#ffffff", "#dfe3d8", "#161a14", "#5a6352", "#556b2f", "#ffffff"),
   },
   {
-    name: "Fjord · steel (trial)",
+    name: "Fjord · steel",
     dark: pal("#0d1225", "#121931", "#25506e", "#eef1f5", "#9fb0c4", "#5aa1cb", "#0d1225"),
     light: pal("#f3f6fa", "#ffffff", "#c9d6e3", "#152232", "#4f6278", "#256b8f", "#ffffff"),
   },
@@ -470,7 +470,7 @@ export function BatchB() {
         id="b2"
         code="B2"
         title="The scheme set"
-        rule="Four schemes, four hue families: Midnight blue, Forest cyan, Slate fuchsia, Matrix moss. YouTube and Starship are gone (a user on them lands on Midnight). Fjord is a trial outside the rule (Midnight's family, Playnite's steel accent): folded into Midnight or removed. Rule: an accent is ≥ 30° of OKLCH hue from danger, warn and success, and ≥ 4.5:1 as text and under its button text, dark and light."
+        rule="Five schemes: four hue families — Midnight blue, Forest cyan, Slate fuchsia, Matrix moss — and Fjord, the one kept exception (Midnight's navy, Playnite's calm steel accent). YouTube and Starship are gone (a user on them lands on Midnight). Rule: an accent is ≥ 30° of OKLCH hue from danger, warn and success, and ≥ 4.5:1 as text and under its button text, dark and light."
       >
         <div className="grid gap-2 grid-cols-[repeat(auto-fill,minmax(9.5rem,1fr))]">
           {SCHEMES.flatMap((s) =>

frontend/src/index.css

@@ -1090,11 +1090,11 @@ html[data-scheme="matrix"][data-theme="light"] {
   --accent-fg: #ffffff;
 }
 
-/* Fjord — TRIAL, not yet a member of the set (docs/DESIGN.md decision log, B2 exception, 2026-09-25):
-   Midnight's navy with Playnite's calm — a muted steel-blue accent and steel rules instead of the vivid
-   periwinkle. It shares Midnight's hue family on purpose; the owner tries it app-wide, then it is folded
-   into Midnight or removed (normalizeTheme lands a stored "fjord" on the default either way). Playnite's
-   own accent (#337599) is 3.7:1 as text, so the accent is the same hue lifted to 6.5:1. */
+/* Fjord — the one scheme outside B2's "own hue family" (docs/DESIGN.md decision log, 2026-09-25 trial,
+   kept 2026-09-27): Midnight's navy with Playnite's calm — a muted steel-blue accent and steel rules
+   instead of the vivid periwinkle. It shares Midnight's hue family on purpose: the owner lived with both
+   and kept both, the vivid and the calm. Playnite's own accent (#337599) is 3.7:1 as text, so the accent
+   is the same hue lifted to 6.5:1. */
 html[data-scheme="fjord"][data-theme="dark"] {
   --bg: #0d1225;
   --surface: #121931;

frontend/src/lib/theme.ts

@@ -11,8 +11,8 @@ export const SCHEMES: { id: Scheme; name: string; swatch: string }[] = [
   { id: "forest", name: "Forest", swatch: "#22d3ee" },
   { id: "slate", name: "Slate", swatch: "#e879f9" },
   { id: "matrix", name: "Matrix", swatch: "#86a05a" },
-  // A TRIAL outside B2 (Midnight's hue family, DESIGN.md decision log 2026-09-25): folded into
-  // Midnight or removed once the owner has tried it; a stored "fjord" then lands on the default.
+  // The one scheme outside B2's "own hue family": Midnight's navy with a calm steel accent, kept
+  // beside Midnight on purpose (DESIGN.md decision log, trial 2026-09-25, kept 2026-09-27).
   { id: "fjord", name: "Fjord", swatch: "#5aa1cb" },
 ];