feat(parsers+api+ui): expose CARC-labeled CAS adjustments (SP3 P2)

src/lib/api.ts

@@ -417,6 +417,22 @@ async function listRemittances<T = unknown>(
   return (await res.json()) as PaginatedResponse<T>;
 }
 
+/**
+ * Fetch one remittance with its labeled CAS `adjustments` array.
+ * Throws `ApiError` on 404 so callers can branch on `.status`.
+ */
+async function getRemittance<T = unknown>(id: string): Promise<T> {
+  if (!isConfigured) throw notConfiguredError();
+  const res = await fetch(joinUrl(`/api/remittances/${encodeURIComponent(id)}`), {
+    headers: { Accept: "application/json" },
+  });
+  if (!res.ok) {
+    const detail = await readErrorBody(res);
+    throw new ApiError(res.status, detail || res.statusText);
+  }
+  return (await res.json()) as T;
+}
+
 async function listProviders<T = unknown>(
   params: ListProvidersParams = {}
 ): Promise<PaginatedResponse<T>> {
@@ -516,6 +532,7 @@ export const api = {
   getBatch,
   listClaims,
   listRemittances,
+  getRemittance,
   listProviders,
   listActivity,
   listUnmatched,