Add Freerouting autoroute integration

4 new MCP tools: autoroute (full DSN→Freerouting→SES pipeline),
export_dsn, import_ses, check_freerouting. Requires Java 11+ and
freerouting.jar. Includes 21 test cases and README usage examples.

src/tools/index.ts

@@ -16,3 +16,4 @@ export { registerUITools } from "./ui.js";
 export { registerDatasheetTools } from "./datasheet.js";
 export { registerFootprintTools } from "./footprint.js";
 export { registerSymbolCreatorTools } from "./symbol-creator.js";
+export { registerFreeroutingTools } from "./freerouting.js";