docs(P20T3-5): 差旅对账边界事件矩阵收口

scripts/validate-feature-matrix.py

@@ -47,6 +47,7 @@ CSV_FACT_SOURCES = [
     ROOT / "issues" / "2026-03-10_12-54-30-p19-ai-1-l5-suggestion-workbench-refresh.csv",
     ROOT / "issues" / "2026-03-10_17-32-21-p20-travel-1-l5-request-intake-refresh.csv",
     ROOT / "issues" / "2026-03-10_21-05-59-p20-travel-2-l5-corporate-payments-refresh.csv",
+    ROOT / "issues" / "2026-03-11_09-57-28-p20-travel-3-l5-reconciliation-erp-bridge-refresh.csv",
 ]
 
 ID_PATTERN = re.compile(r"^[A-Z][0-9][0-9A-Za-z-]*$")