Use unique contact identifiers for KOC claims

tests/claimant-identifier.test.mjs

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+import assert from "node:assert/strict";
+import test from "node:test";
+import { parseClaimantIdentifier } from "../lib/claimant-identifier.ts";
+
+test("normalizes mainland mobile numbers into one unique identity", () => {
+  assert.deepEqual(parseClaimantIdentifier("+86 138-0013-8000"), {
+    canonical: "phone:13800138000",
+    display: "13800138000",
+    kind: "phone",
+  });
+  assert.deepEqual(parseClaimantIdentifier("手机号：13800138000"), {
+    canonical: "phone:13800138000",
+    display: "13800138000",
+    kind: "phone",
+  });
+});
+
+test("normalizes WeChat IDs case-insensitively while preserving display", () => {
+  assert.deepEqual(parseClaimantIdentifier("微信号：Koc_User-01"), {
+    canonical: "wechat:koc_user-01",
+    display: "Koc_User-01",
+    kind: "wechat",
+  });
+});
+
+test("rejects nicknames and malformed identifiers", () => {
+  assert.equal(parseClaimantIdentifier("巫凤萍"), null);
+  assert.equal(parseClaimantIdentifier("1380013800"), null);
+  assert.equal(parseClaimantIdentifier("123456"), null);
+});