feat(phase-30): add coverage snapshots, temporal comparison and auto re-testing (T-230 to T-232)

frontend/src/api/tests.ts

@@ -204,6 +204,26 @@ export async function getTestTimeline(
   return data;
 }
 
+// ── Retest Chain ────────────────────────────────────────────────────
+
+export interface RetestChainEntry {
+  id: string;
+  name: string;
+  state: string | null;
+  retest_of: string | null;
+  retest_count: number;
+  result: string | null;
+  detection_result: string | null;
+  remediation_status: string | null;
+  created_at: string | null;
+}
+
+/** Get the full retest chain for a test. */
+export async function getRetestChain(testId: string): Promise<RetestChainEntry[]> {
+  const { data } = await client.get<RetestChainEntry[]>(`/tests/${testId}/retest-chain`);
+  return data;
+}
+
 // ── Legacy (kept for backwards compat) ─────────────────────────────
 
 /** Validate a test (legacy endpoint). */