fix: address review issues in get_wire_connections

- Fix critical bug: use pin_data[0]/[1] instead of pin_data["x"]/["y"]
  (get_all_symbol_pins returns List[float], not dict)
- Use index-based wire tracking to avoid fragile float list equality
- Check all polyline points (not just endpoints) during flood-fill
- Add spatial index (0.05mm grid) to replace O(n²) frontier scan
- Skip already-processed refs to avoid redundant calls for multi-unit symbols
- Include wires_out in early return when schematic has no symbols
- Add get_wire_connections schema entry to tool_schemas.py

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

python/schemas/tool_schemas.py

@@ -1471,6 +1471,29 @@ SCHEMATIC_TOOLS = [
             "required": ["schematicPath", "netName"],
         },
     },
+    {
+        "name": "get_wire_connections",
+        "title": "Get Wire Connections",
+        "description": "Returns all wires and component pins connected to the wire at a given point, by flood-filling through touching wires.",
+        "inputSchema": {
+            "type": "object",
+            "properties": {
+                "schematicPath": {
+                    "type": "string",
+                    "description": "Path to schematic file"
+                },
+                "x": {
+                    "type": "number",
+                    "description": "X coordinate of the point on the wire"
+                },
+                "y": {
+                    "type": "number",
+                    "description": "Y coordinate of the point on the wire"
+                }
+            },
+            "required": ["schematicPath", "x", "y"]
+        }
+    },
     {
         "name": "get_schematic_pin_locations",
         "title": "Get Schematic Pin Locations",