Gate interface certifiers to connectors on this board (2.61.2).

USB-C/RJ45/PoE/DDR3 are the method, not a catalog. No connector means
no finding. Bare RJ45 is Ethernet only; PoE needs PoE evidence. HubAudio
has USB-C and PoE MagJack, not DDR. Skip-I unchanged.

tests/test_interface_class_check.py

@@ -128,7 +128,8 @@ def _usbc_device_graph(*, ss: bool = False, usb2_value: bool = True) -> DesignGr
     return DesignGraph(components=comps, nets=nets)
 
 
-def test_no_connector_is_na_not_error():
+def test_no_connector_emits_nothing():
+    """No USB-C / no RJ45 / no PoE evidence → do not emit that certifier."""
     g = DesignGraph(
         components={
             "U1": _comp("U1", ctype=ComponentType.IC, value="MCU", pins={"1": "GND"}),
@@ -136,16 +137,8 @@ def test_no_connector_is_na_not_error():
         nets={"GND": _net("GND", NetType.GROUND, ("U1", "1"))},
     )
     findings = check_interface_classes(g)
-    for f in findings:
-        complete_finding(f)
-    assert _by_rule(findings, "PE-USBC-001")
-    assert _by_rule(findings, "PE-ETH-001")
-    assert _by_rule(findings, "PE-POE-001")
-    assert all(f.status != "ERROR" for f in findings)
-    assert all(f.finding_class == "INFO" for f in findings)
-    assert "N/A" in _by_rule(findings, "PE-USBC-001")[0].finding
-    assert "N/A" in _by_rule(findings, "PE-ETH-001")[0].finding
-    assert "N/A" in _by_rule(findings, "PE-POE-001")[0].finding
+    assert findings == []
+    assert not any((f.rule_id or "").startswith("PE-DDR") for f in findings)
 
 
 def test_usbc_rd_vbus_gnd_certified():
@@ -166,6 +159,7 @@ def test_usbc_rd_vbus_gnd_certified():
     assert ss.finding_class == "INFO"
     assert "N/A" in ss.finding or "USB2" in ss.finding
     assert all(f.status != "ERROR" for f in findings if f.designator == "J2")
+    assert not any((f.rule_id or "").startswith(("PE-ETH", "PE-POE", "PE-DDR")) for f in findings)
 
 
 def test_usbc_missing_cc2_is_error():
@@ -429,13 +423,11 @@ def test_bare_rj45_does_not_invent_poe():
     findings = check_interface_classes(g)
     for f in findings:
         complete_finding(f)
-    poe = _by_rule(findings, "PE-POE-001", "J1")[0]
-    assert poe.status != "ERROR"
-    assert poe.finding_class == "INFO"
-    assert "N/A" in poe.finding
-    assert not _by_rule(findings, "PE-POE-003", "J1") or _by_rule(
-        findings, "PE-POE-003", "J1",
-    )[0].status != "ERROR"
+    assert _by_rule(findings, "PE-ETH-001", "J1")
+    assert not any((f.rule_id or "").startswith("PE-POE") for f in findings)
+    assert not any((f.rule_id or "").startswith("PE-USBC") for f in findings)
+    assert not any((f.rule_id or "").startswith("PE-DDR") for f in findings)
+    assert all(f.status != "ERROR" for f in findings if (f.rule_id or "").startswith("PE-ETH"))
 
 
 def test_poe_with_evidence_requires_magnetics_isolation():
@@ -494,10 +486,9 @@ def test_simple_project_usbc_not_false_error():
     ss = _by_rule(findings, "PE-USBC-005", "J1")[0]
     assert ss.status != "ERROR"
     assert ss.evidence_status == "INSUFFICIENT" or "N/A" in ss.finding
-    assert _by_rule(findings, "PE-ETH-001")[0].status != "ERROR"
-    assert "N/A" in _by_rule(findings, "PE-ETH-001")[0].finding
-    assert _by_rule(findings, "PE-POE-001")[0].status != "ERROR"
-    assert "N/A" in _by_rule(findings, "PE-POE-001")[0].finding
+    assert not any((f.rule_id or "").startswith("PE-ETH") for f in findings)
+    assert not any((f.rule_id or "").startswith("PE-POE") for f in findings)
+    assert not any((f.rule_id or "").startswith("PE-DDR") for f in findings)
 
 
 def test_hubaudio_like_usbc_usb2_and_poe_magjack():
@@ -538,6 +529,17 @@ def test_hubaudio_like_usbc_usb2_and_poe_magjack():
         for f in findings
         if (f.rule_id or "").startswith(("PE-USBC", "PE-ETH", "PE-POE"))
     )
+    assert not any((f.rule_id or "").startswith("PE-DDR") for f in findings)
+
+
+def test_hubaudio_bom_has_usbc_and_poe_rj45_not_ddr():
+    """HubAudio actual parts: J2 USB-C USB2 16P, J1 PoE 10/100 MagJack, no DDR."""
+    from tests.paths import REPO_ROOT
+    bom = (REPO_ROOT / "tests" / "fixtures" / "hubaudio_kicad_bom.csv").read_text()
+    assert "USB_C_Receptacle_USB2.0_16P" in bom
+    assert "RJ45" in bom and "PoE" in bom
+    assert "DDR3" not in bom and "DDR2" not in bom and "DDR4" not in bom
+    assert "USB3" not in bom
 
 
 def test_rule_catalog_shared_not_si():
@@ -551,16 +553,14 @@ def test_rule_catalog_shared_not_si():
         assert rec.domain == "shared"
 
 
-def test_run_pcb_checks_includes_interface_class():
+def test_run_pcb_checks_skips_absent_interfaces():
     findings = run_pcb_checks(DesignGraph(), {}, None)
     ids = {f.rule_id for f in findings}
-    assert "PE-USBC-001" in ids
-    assert "PE-ETH-001" in ids
-    assert "PE-POE-001" in ids
-    if_f = [f for f in findings if (f.rule_id or "").startswith(("PE-USBC", "PE-ETH", "PE-POE"))]
-    assert if_f
-    assert all(f.status != "ERROR" for f in if_f)
-    assert all((f.finding_id or "").startswith("PCB-") for f in if_f)
+    assert "PE-USBC-001" not in ids
+    assert "PE-ETH-001" not in ids
+    assert "PE-POE-001" not in ids
+    if_f = [f for f in findings if (f.rule_id or "").startswith(("PE-USBC", "PE-ETH", "PE-POE", "PE-DDR"))]
+    assert if_f == []
 
 
 def test_merge_drops_duplicate_pcb_interface_findings():