docs/test(P19-5,P19-6): 收口P19矩阵文档与校验

scripts/validate-feature-matrix.py

@@ -37,6 +37,7 @@ CSV_FACT_SOURCES = [
     ROOT / "issues" / "2026-03-07_21-00-37-p17b-l5-procurement-budget-archive.csv",
     ROOT / "issues" / "2026-03-07_22-02-09-p18a-l5-asset-registry-core.csv",
     ROOT / "issues" / "2026-03-07_22-34-03-p18b-l5-asset-movements-inventory.csv",
+    ROOT / "issues" / "2026-03-07_23-22-00-p19-l4-integration-readiness.csv",
 ]
 
 ID_PATTERN = re.compile(r"^[A-Z][0-9][0-9A-Za-z-]*$")