diff --git a/frontend/src/lib/legal-entity.ts b/frontend/src/lib/legal-entity.ts
new file mode 100644
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--- /dev/null
+++ b/frontend/src/lib/legal-entity.ts
@@ -0,0 +1,34 @@
+/**
+ * Who runs Jyotisha and how users reach them (2026-09-30, compliance round).
+ *
+ * One place for the operator's legal name, address and contact channels, read
+ * by the user agreement, the privacy policy, the account-deletion notice and
+ * the feedback entry. The product owner will supply the real values; until
+ * then they are loud placeholders, and `legalEntityPlaceholders()` lets the
+ * production release checks refuse to ship them.
+ */
+export const LEGAL_ENTITY = {
+  /** 运营主体全称（公司或个体工商户），用于协议与隐私政策的「我们」。 */
+  operatorName: "【待填写：运营主体全称】",
+  /** 注册地址或联系地址。 */
+  address: "【待填写：联系地址】",
+  /** 用户与监管联系的邮箱（客服、投诉、个人信息请求）。 */
+  contactEmail: "【待填写：客服邮箱】",
+  /** 可选：客服电话或微信；为空则不显示。 */
+  contactPhone: "",
+  /** ICP 备案号；为空则页脚不显示。 */
+  icpNumber: "",
+  /** 协议与隐私政策文本版本；律师审定后改为正式版本号。 */
+  legalDocumentsVersion: "2026-09-30-draft",
+  /** 文本是否仍是草稿（未经律师审定）。页面顶部据此显示「草稿」标识。 */
+  legalDocumentsDraft: true,
+} as const;
+
+const PLACEHOLDER = /【待填写/;
+
+/** Field names still holding a placeholder; empty when every required value is real. */
+export function legalEntityPlaceholders(entity: Readonly<Record<string, unknown>> = LEGAL_ENTITY): string[] {
+  return Object.entries(entity)
+    .filter(([, value]) => typeof value === "string" && PLACEHOLDER.test(value))
+    .map(([key]) => key);
+}