Fix attachment overshoot and semantic trace port geometry

crates/oa-core/src/routing.rs

@@ -565,7 +565,7 @@ fn route_diagram_impl(
                 project,
                 diagram,
                 source,
-                edge.source_port,
+                semantic_port_endpoint(project, edge.id, EdgeEnd::Source).or(edge.source_port),
                 view,
                 attachments[0],
             ),
@@ -573,7 +573,7 @@ fn route_diagram_impl(
                 project,
                 diagram,
                 target,
-                edge.target_port,
+                semantic_port_endpoint(project, edge.id, EdgeEnd::Target).or(edge.target_port),
                 view,
                 attachments[1],
             ),

crates/oa-core/src/routing/attachments.rs

@@ -104,10 +104,21 @@ pub fn attachment_from_point(
         side,
         offset: projection::port_anchor_offset(node, side, cursor),
     };
+    // Measure side intent at the box, not from a distant overshoot: Euclidean
+    // distance differences converge outside a small symbol and would otherwise
+    // let hysteresis retain a perpendicular side indefinitely.
+    let boundary_cursor = pos(
+        cursor
+            .x
+            .clamp(node.position.x, node.position.x + node.size.width),
+        cursor
+            .y
+            .clamp(node.position.y, node.position.y + node.size.height),
+    );
     let distance = |side| {
         length(
             projection::port_anchor_position(node, side, candidate(side).offset),
-            cursor,
+            boundary_cursor,
         )
     };
     let mut side = [

crates/oa-core/src/source_defaults.rs

@@ -96,8 +96,12 @@ fn restore_serialization_skips(context: Context, fields: &mut Map<String, Value>
         Context::Diagram => {
             if let Some(routes) = fields.get_mut("routes").and_then(Value::as_array_mut) {
                 for route in routes.iter_mut().filter_map(Value::as_object_mut) {
-                    route.entry("source_attachment".to_owned()).or_insert(Value::Null);
-                    route.entry("target_attachment".to_owned()).or_insert(Value::Null);
+                    route
+                        .entry("source_attachment".to_owned())
+                        .or_insert(Value::Null);
+                    route
+                        .entry("target_attachment".to_owned())
+                        .or_insert(Value::Null);
                 }
             }
         }
@@ -252,7 +256,12 @@ fn compact_nested(context: Context, fields: &mut Map<String, Value>) {
             if let Some(routes) = fields.get_mut("routes").and_then(Value::as_array_mut) {
                 for route in routes {
                     if let Some(route) = route.as_object_mut() {
-                        omit_defaults(route, &object(json!({"waypoints": [], "label": null, "source_attachment": null, "target_attachment": null})));
+                        omit_defaults(
+                            route,
+                            &object(
+                                json!({"waypoints": [], "label": null, "source_attachment": null, "target_attachment": null}),
+                            ),
+                        );
                     }
                 }
             }

crates/oa-core/src/validation.rs

@@ -643,7 +643,10 @@ pub fn validate(p: &Project) -> Vec<Issue> {
         }
         let mut routed_edges = BTreeSet::new();
         for (index, route) in d.routes.iter().enumerate() {
-            for attachment in [route.source_attachment, route.target_attachment].into_iter().flatten() {
+            for attachment in [route.source_attachment, route.target_attachment]
+                .into_iter()
+                .flatten()
+            {
                 if !attachment.offset.is_finite() || !(0.0..=1.0).contains(&attachment.offset) {
                     error(
                         &mut out,