Stamp 2.60.0 incomplete PCB exam and owner project delete.

Partial layouts still use MODE=pcb. Missing copper is INSUFFICIENT or
skipped, never Euclidean stand-in tracks. Via≠Pad unchanged. DELETE
/api/projects/{id} is owner-only with a dashboard confirm dialog.

tests/test_placement_check.py

@@ -186,10 +186,13 @@ def _x1_c9_layout(*, segments=None, cap_x: float = 0.5):
 
 def test_crystal_load_cap_beyond_max_distance_mm_is_ps_plc_001():
     limit = 2.0
+    segs = [
+        LayoutSegment(start=(0.0, 0.0), end=(10.0, 0.0), width=0.2, layer="F.Cu", net="/HFXIN"),
+    ]
     findings = check_placement(
         _graph(),
         _xtal_cons(max_distance_mm=limit),
-        _x1_c9_layout(cap_x=10.0),
+        _x1_c9_layout(cap_x=10.0, segments=segs),
     )
     plc = [f for f in findings if f.rule_id == "PE-PLC-001"]
     assert len(plc) == 1
@@ -198,13 +201,29 @@ def test_crystal_load_cap_beyond_max_distance_mm_is_ps_plc_001():
 
 
 def test_crystal_load_cap_within_max_distance_mm_is_silent():
+    segs = [
+        LayoutSegment(start=(0.0, 0.0), end=(0.5, 0.0), width=0.2, layer="F.Cu", net="/HFXIN"),
+    ]
     assert check_placement(
         _graph(),
         _xtal_cons(max_distance_mm=2.0),
-        _x1_c9_layout(cap_x=0.5),
+        _x1_c9_layout(cap_x=0.5, segments=segs),
     ) == []
 
 
+def test_unrouted_crystal_cap_is_insufficient_not_euclidean():
+    findings = check_placement(
+        _graph(),
+        _xtal_cons(max_distance_mm=2.0),
+        _x1_c9_layout(cap_x=10.0),
+    )
+    assert all(f.rule_id != "PE-PLC-001" for f in findings)
+    insuf = [f for f in findings if f.rule_id == "PE-PLC-005"]
+    assert len(insuf) == 1
+    assert insuf[0].evidence_status == "INSUFFICIENT"
+    assert insuf[0].status == "INFO"
+
+
 def test_track_path_longer_than_max_distance_mm_is_ps_plc_001():
     limit = 2.0
     segs = [