docs: consolidate design documentation and standardize crate English

web/workspace/tests/bevel-contract.test.ts

@@ -10,12 +10,6 @@ Deno.test("Bevel draws a plain selectable border around semantic children", asyn
   const appCss = await Deno.readTextFile(
     new URL("../src/app.css", import.meta.url),
   );
-  const designLanguage = await Deno.readTextFile(
-    new URL(
-      "../../../docs/development/ui-ux/design-language.md",
-      import.meta.url,
-    ),
-  );
 
   for (
     const contract of [
@@ -73,14 +67,6 @@ Deno.test("Bevel draws a plain selectable border around semantic children", asyn
       source.includes("button, input, select, textarea"),
     "Bevel must not own surface color and must keep semantic controls as children",
   );
-  assert(
-    designLanguage.includes("1pxの単色borderを描くvisual wrapper") &&
-      designLanguage.includes(
-        "照明、raised／inset、ridge／grooveを表現しない",
-      ) &&
-      designLanguage.includes("text/content areaへ適用する"),
-    "The design language must define Bevel as a plain border without surface ownership",
-  );
 });
 
 Deno.test("Workspace showroom exercises closed and adjacent borders", async () => {

web/workspace/tests/bevel-line-contract.test.ts

@@ -83,12 +83,6 @@ Deno.test("Shell regions use selected Bevel edges while open separators use Beve
       import.meta.url,
     ),
   );
-  const designLanguage = await Deno.readTextFile(
-    new URL(
-      "../../../docs/development/ui-ux/design-language.md",
-      import.meta.url,
-    ),
-  );
 
   assert(
     rootLayout.includes('class="app-shell__topbar-bevel"') &&
@@ -109,18 +103,9 @@ Deno.test("Shell regions use selected Bevel edges while open separators use Beve
     "Desktop shell boundaries must use one selected border edge and Mobile must share Header fold state",
   );
   assert(
-    designLanguage.includes(
-      "Headerのbottom edgeとSidebarのright edgeだけを有効",
-    ) &&
-      designLanguage.includes("Mobileのfold controlはHeaderに置く") &&
-      designLanguage.includes("main contentと同時表示しない") &&
-      designLanguage.includes("同じlayerではheading、本文、Lineの端を揃え") &&
-      designLanguage.includes(
-        "親layoutがそのlayer全体へinline方向の余白を与え",
-      ) &&
-      showroomCss.includes(".resource-list {") &&
+    showroomCss.includes(".resource-list {") &&
       showroomCss.includes("margin-inline: var(--space-2)"),
-    "The design language and showroom must preserve adjacent area and line hierarchy",
+    "showroomはresource layer全体の余白を維持する",
   );
   assert(
     sidebarCss.includes(".section-action {") &&

web/workspace/tests/typography-contract.test.ts

@@ -51,12 +51,6 @@ Deno.test("Workspace typography tokens bind the documented three-level scale", a
   const appCss = await Deno.readTextFile(
     new URL("../src/app.css", import.meta.url),
   );
-  const designLanguage = await Deno.readTextFile(
-    new URL(
-      "../../../docs/development/ui-ux/design-language.md",
-      import.meta.url,
-    ),
-  );
 
   for (
     const contract of [
@@ -73,12 +67,4 @@ Deno.test("Workspace typography tokens bind the documented three-level scale", a
   ) {
     assert(appCss.includes(contract), `app.css must preserve ${contract}`);
   }
-
-  assert(
-    designLanguage.includes("--font-size-title /* 24px */") &&
-      designLanguage.includes("--font-size-body /* 14px */") &&
-      designLanguage.includes("--font-size-compact /* 12px */") &&
-      designLanguage.includes("`12px`未満と`13px`を使わない"),
-    "The design language must preserve the title, body, and compact typography contract",
-  );
 });