feat(evaluations): enrich eval tests with attack path, criteria and data sources

- Capture Step.Description (HTML stripped), step name/number, substep ref,
  criteria, and data sources from MITRE ATT&CK Evaluations API
- _aggregate_by_technique() now accumulates ALL occurrences per technique
  (multiple substep refs, criteria, step contexts) instead of keeping only
  the best-scoring one
- New helper functions _build_procedure_text(), _build_description(),
  _build_red_summary() generate rich narratives from accumulated occurrences
- New re_enrich_evaluation_round() service function + POST endpoint
  /system/attck-evaluations/re-enrich to update already-imported tests
  without changing detection results or validation state
- Frontend: Re-enrich button per imported round + result banner in SystemPage

frontend/src/api/system.ts

@@ -109,6 +109,14 @@ export interface BulkApproveResult {
   message: string;
 }
 
+export interface ReEnrichResult {
+  updated: number;
+  skipped: number;
+  adversary: string;
+  eval_round: number;
+  message: string;
+}
+
 /** Bulk-approve all in-review evaluation tests (Blue Team side). */
 export async function bulkApproveEvaluationTests(): Promise<BulkApproveResult> {
   const { data } = await client.post<BulkApproveResult>("/system/attck-evaluations/bulk-approve");
@@ -120,3 +128,13 @@ export async function getEvalPendingCount(): Promise<{ pending: number }> {
   const { data } = await client.get<{ pending: number }>("/system/attck-evaluations/pending-count");
   return data;
 }
+
+/** Re-enrich an already-imported round with attack path, criteria and data sources. */
+export async function reEnrichEvaluationRound(payload: {
+  adversary_name: string;
+  adversary_display: string;
+  eval_round: number;
+}): Promise<ReEnrichResult> {
+  const { data } = await client.post<ReEnrichResult>("/system/attck-evaluations/re-enrich", payload);
+  return data;
+}