docs(R11-5): R11矩阵事实源收口至278项

scripts/validate-feature-matrix.py

@@ -51,6 +51,7 @@ CSV_FACT_SOURCES = [
     ROOT / "issues" / "2026-03-11_17-50-39-p21-pwa-1-l5-asset-scan-refresh.csv",
     ROOT / "issues" / "2026-03-12_04-32-13-p21-pwa-2-l5-offline-deeplink-refresh.csv",
     ROOT / "issues" / "2026-03-12_16-58-44-p22-prod-1-l5-production-hardening.csv",
+    ROOT / "issues" / "2026-03-13_10-30-00-r11-contract-reconciliation-and-spec-refresh.csv",
 ]
 
 ID_PATTERN = re.compile(r"^[A-Z][0-9][0-9A-Za-z-]*$")