Check ImpedenceFinder against datasheet SI rules, not a dump table.

Each layout_rules SI requirement (diff/SE Z, skew, max length, spacing,
ref plane, vias, layer, return, series R) is one PASS/FAIL/MARGIN finding
with FACT and REQUIREMENT. USB/HDMI/PCIe/ETH/LVDS/DDR only; I2C GPIO CC
and analog REGN are skipped. No invented 90 Ω.

skills/extract-pintable/validate.py

@@ -85,7 +85,11 @@ def validate(data: dict) -> list[str]:
         if not isinstance(data["layout_rules"], list):
             errors.append("layout_rules must be an array")
         else:
-            kinds = {"decoupling_proximity", "thermal_via", "keepout", "length_match"}
+            kinds = {
+                "decoupling_proximity", "thermal_via", "keepout", "length_match",
+                "impedance", "max_length", "spacing", "ref_plane", "si_via",
+                "layer", "series_resistor", "return_path", "si",
+            }
             for i, row in enumerate(data["layout_rules"]):
                 if not isinstance(row, dict):
                     errors.append(f"layout_rules[{i}] must be an object")