fix(sensor): use published coordinates for custom SRIDs

Result validation bypassed the project-specific GIS transform and called ST_Transform on custom engineering SRIDs. Read project and map coordinates from gis.junctions so every project uses its configured publication transform.

tests/unit/test_sensor_placement_service.py

@@ -122,7 +122,7 @@ def test_list_sensor_placements_batches_node_lookup(monkeypatch):
     assert [len(run["sensor_points"]) for run in runs] == [2, 2]
 
 
-def test_sensor_nodes_query_uses_new_network_and_gis_schemas(monkeypatch):
+def test_sensor_nodes_query_uses_published_junction_coordinates(monkeypatch):
     cursor = _mock_project_cursor(monkeypatch)
     cursor.fetchall.return_value = []
 
@@ -131,8 +131,11 @@ def test_sensor_nodes_query_uses_new_network_and_gis_schemas(monkeypatch):
     query = cursor.execute.call_args.args[0]
     assert "network.pipes" in query
     assert "network.links" in query
-    assert "gis.node_geometries" in query
-    assert "ST_Transform(g.geom, 3857)" in query
+    assert "FROM gis.junctions AS g" in query
+    assert "g.x AS project_x" in query
+    assert "ST_X(g.geom) AS map_x" in query
+    assert "gis.node_geometries" not in query
+    assert "ST_Transform" not in query
     assert "l.start_node_id = ANY(%s)" in query
     assert "l.end_node_id = ANY(%s)" in query
     assert "CROSS JOIN LATERAL" not in query