fix(sourceWorker): inherit execArgv so tsx loader reaches micro-workers

Worker threads spawned via new Worker(__filename) do not inherit
process.execArgv, causing them to crash when the parent was started
with --import tsx. Passing execArgv: process.execArgv fixes the
crash-respawn loop seen with the default npm start script.

Author: dripink

src/workers/source.ts

@@ -143,7 +143,8 @@ if (isMainThread) {
         config,
         silentLogs: specConfig.silentLogs ?? false,
         threadId: threadNumber
-      } satisfies WorkerData
+      } satisfies WorkerData,
+      execArgv: process.execArgv
     }) as MicroWorker
 
     worker.ready = false