Add protocol-certification M3 L1 geometric certifier (2.67.0).

Length, topology, vias, stubs, layer, grouping. Skew only vs NUMERIC mm or DESIGN LIMIT. No invented ohms/mm/ps. Not electrical. No L2/L3.

tests/pcb/test_protocol_l0_m2.py

@@ -13,7 +13,6 @@ from backend.periscopex.models import (
     PinConnection,
 )
 from backend.periscopex.protocol_l0 import (
-    PACK_MACROPHASE,
     _pack,
     certify_l0,
     protocol_exam,
@@ -130,8 +129,9 @@ def test_axi_internal_l0_not_applicable_not_fail():
     assert all(r.result == "NOT_APPLICABLE" for r in rows)
     assert all(r.result != "FAIL" for r in rows)
     sec, findings = protocol_exam(_axi_graph())
-    assert sec.max_level_reached == "L0"
-    assert sec.macrophase == PACK_MACROPHASE
+    assert sec.max_level_reached == "L1"
+    from backend.periscopex.protocol_l1 import PACK_MACROPHASE as L1_MACRO
+    assert sec.macrophase == L1_MACRO
     assert all(f.status != "ERROR" for f in findings)
     assert all("AXI_AWVALID" not in (f.net or "") for f in findings if f.rule_id == "PE-PRT-L0-001")