feat(api): publish validated OpenAPI contract

apps/web/src/app/openapi.yaml/route.ts

@@ -0,0 +1,13 @@
+import { readFile } from "node:fs/promises";
+import { resolve } from "node:path";
+
+export const runtime = "nodejs";
+export const dynamic = "force-static";
+
+/** Build-time snapshot of the single source; no YAML parsing or rewriting. */
+export async function GET() {
+  const specification = await readFile(resolve(process.cwd(), "../../openapi.yaml"));
+  return new Response(specification, {
+    headers: { "content-type": "application/yaml; charset=utf-8" },
+  });
+}