docs/test(P17B-5,P17B-6): 收口采购矩阵文档与回归

scripts/validate-feature-matrix.py

@@ -34,6 +34,7 @@ CSV_FACT_SOURCES = [
     ROOT / "issues" / "2026-03-07_18-15-03-r9-g2-p19-roadmap-refresh.csv",
     ROOT / "issues" / "2026-03-07_18-16-00-g2-l5-cross-domain-bridge.csv",
     ROOT / "issues" / "2026-03-07_19-33-09-p17a-l5-procurement-core.csv",
+    ROOT / "issues" / "2026-03-07_21-00-37-p17b-l5-procurement-budget-archive.csv",
 ]
 
 ID_PATTERN = re.compile(r"^[A-Z][0-9][0-9A-Za-z-]*$")