Include switches in the schematic

ISwitch extends IContinuity, so SchematicBuilder.isEligible() was filtering
every switch out of the schematic even though the netlist (built with
includeSwitches=false) keeps them as regular nodes with connections.
isEligible() now treats ISwitch as an eligible symbol; with no dedicated
factory yet it falls back to a GenericBoxSchematicFactory box carrying the
switch's lug node names, and gets wired like any other symbol.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01FWD3QJxbr7RuEHxyFEYeEY

diylc/diylc-library/src/main/java/org/diylc/schematic/SchematicBuilder.java

@@ -38,6 +38,7 @@ import org.diylc.components.schematic.SchematicWire;
 import org.diylc.core.IContinuity;
 import org.diylc.core.ICommonNode;
 import org.diylc.core.IDIYComponent;
+import org.diylc.core.ISwitch;
 import org.diylc.core.Project;
 import org.diylc.core.SchematicView;
 import org.diylc.netlist.Group;
@@ -151,6 +152,9 @@ public class SchematicBuilder {
     if (component instanceof ICommonNode) {
       return true; // ground / common node symbols pass through
     }
+    if (component instanceof ISwitch) {
+      return true; // switches are drawn as symbols (netlist is built with includeSwitches=false)
+    }
     if (component instanceof IContinuity) {
       return false; // wires, traces, solder bridges, board strips
     }

diylc/diylc-library/src/test/java/org/diylc/schematic/GenericBoxSchematicFactoryTest.java

@@ -25,8 +25,9 @@ import static org.junit.Assert.assertTrue;
 
 import java.util.List;
 
-import org.diylc.components.semiconductors.ICSymbol;
+import org.diylc.components.electromechanical.MiniToggleSwitch;
 import org.diylc.components.schematic.SchematicBox;
+import org.diylc.components.semiconductors.ICSymbol;
 import org.junit.Test;
 
 public class GenericBoxSchematicFactoryTest {
@@ -56,6 +57,20 @@ public class GenericBoxSchematicFactoryTest {
     assertEquals("IC1", mapping.getSchematicSymbol().getName());
   }
 
+  @Test
+  public void switchesAreEligibleAndFallBackToABox() {
+    MiniToggleSwitch sw = new MiniToggleSwitch();
+    sw.setName("SW1");
+
+    assertTrue(SchematicBuilder.isEligible(sw));
+
+    List<SchematicSymbolMapping> mappings =
+        new GenericBoxSchematicFactory().createSchematicSymbols(sw);
+    assertEquals(1, mappings.size());
+    assertTrue(mappings.get(0).getSchematicSymbol() instanceof SchematicBox);
+    assertTrue(mappings.get(0).getSchematicSymbol().getControlPointCount() >= 2);
+  }
+
   @Test
   public void schematicBoxExposesConfiguredNodeNames() {
     SchematicBox box = new SchematicBox();

diylc/docs/schematic_view_plan.md

@@ -436,7 +436,7 @@ The schematic uses the **existing `DrawingManager` + `Presenter`** rendering pip
 - `SchematicBox` component (`org.diylc.components.schematic`) — generic box with configurable left/right/top/bottom comma-separated terminal lists, NAME/VALUE/BOTH/NONE display.
 - `SchematicWire` component — auto-routed Manhattan connection; implements `IContinuity`; stores source/target component id + pin index and the calculated `routePoints`; deep-cloned.
 - `ManhattanRouter` — straight / L / HVH / VHV routing with pin exit-direction preference and overlap/crossing cost scoring against existing segments.
-- `GenericBoxSchematicFactory` (default fallback) + `SchematicBuilder` (filter, symbol creation, connection-density grid placement, per-net wire chaining, canvas auto-resize) + `SchematicSynchronizer` (add/remove/keep-position incremental sync, full wire rebuild).
+- `GenericBoxSchematicFactory` (default fallback) + `SchematicBuilder` (filter, symbol creation, connection-density grid placement, per-net wire chaining, canvas auto-resize) + `SchematicSynchronizer` (add/remove/keep-position incremental sync, full wire rebuild). Switches (`ISwitch`, which extends `IContinuity`) are treated as regular symbols — the generic box fallback until a dedicated factory is added — since the netlist is built with `includeSwitches=false`.
 - Concrete factories: `Resistor`, `Capacitor`, `Diode`, `Transistor` (→ `BJTSymbol`), `Inductor`, `Potentiometer`, wired onto the common physical component types (resistors, film/ceramic/electrolytic/tantalum/mica caps, plastic/glass diodes, TO-1/92/126/220/3 transistors, radial/toroidal inductors, panel/trimmer/miniature pots).
 
 **diylc-swing**