Add IFA/meander/stub antenna templates with SVG and KiCad export.

Progetta now returns a parametric radiator geometry (segments + preview + .kicad_mod) so the layout can be replicated without inventing EM results.

Co-authored-by: Cursor <cursoragent@cursor.com>

tests/test_antenna_rf.py

@@ -177,3 +177,79 @@ def test_design_recipe_ready_with_ant_and_stackup():
     assert recipe.radiator.length_mm_suggest is not None
     assert recipe.zone is not None
     assert recipe.zone.bbox_mm is not None
+    assert recipe.geometry is not None
+    assert recipe.geometry.template == "ifa"
+    assert recipe.geometry.fit in ("ok", "scaled")
+    assert len(recipe.geometry.segments) >= 2
+    assert recipe.geometry.svg and "<svg" in recipe.geometry.svg
+    assert recipe.geometry.kicad_mod and '(footprint "' in recipe.geometry.kicad_mod
+    assert "fp_line" in recipe.geometry.kicad_mod
+
+
+def test_geometry_templates_produce_export():
+    from backend.pinscopex.antenna_geometry import build_geometry
+
+    for tmpl in ("ifa", "meander", "stub"):
+        geo = build_geometry(tmpl, f0_mhz=2440.0, w_mm=0.4, er=4.5)
+        assert geo.fit == "ok"
+        assert geo.total_length_mm is not None and geo.total_length_mm > 10
+        assert geo.length_ideal_mm is not None
+        assert geo.total_length_mm >= geo.length_ideal_mm * 0.9
+        assert geo.svg and "path" in geo.svg
+        assert geo.kicad_mod and '(pad "1"' in geo.kicad_mod
+        assert len(geo.segments) >= 1
+
+
+def test_geometry_overflow_tiny_zone():
+    from backend.pinscopex.antenna_geometry import build_geometry
+
+    geo = build_geometry(
+        "ifa",
+        f0_mhz=2440.0,
+        w_mm=0.4,
+        er=4.5,
+        zone_bbox_mm=(0.0, 0.0, 2.0, 1.0),
+        feed_xy=(0.0, 0.0),
+    )
+    assert geo.fit == "overflow"
+    assert not geo.segments
+
+
+def test_design_recipe_meander_template():
+    g = DesignGraph(
+        components={
+            "ANT1": Component(
+                reference="ANT1", value="feed", footprint="",
+                component_type=ComponentType.CONNECTOR,
+                pins={"1": "ANT_FEED"},
+            ),
+        },
+        nets={
+            "ANT_FEED": Net(
+                name="ANT_FEED", net_type=NetType.SIGNAL,
+                pins=[PinConnection(component_ref="ANT1", pin_number="1")],
+            ),
+        },
+    )
+    layout = LayoutGraph(
+        footprints={
+            "ANT1": LayoutFootprint(
+                reference="ANT1", x=0.0, y=0.0, layer="F.Cu",
+                pads=[LayoutPad(number="1", x=0.0, y=0.0, net="ANT_FEED")],
+            ),
+        },
+        nets={"ANT_FEED": 1},
+        stackup=LayoutStackup(
+            copper_layers=["F.Cu", "B.Cu"],
+            dielectrics=[LayoutDielectric(name="FR4", er=4.5, height_mm=0.2)],
+            copper_thickness_mm=0.035,
+        ),
+    )
+    recipe = build_design_recipe(
+        g, layout, f0_mhz=2440.0, template="meander",
+    )
+    assert recipe.status == "ready"
+    assert recipe.geometry is not None
+    assert recipe.geometry.template == "meander"
+    assert recipe.geometry.fit == "ok"
+    assert recipe.geometry.kicad_mod is not None