Add packaged DLP broker and protected Windows service foundation

tests/fixtures/broker-service-stdio-child.cjs

@@ -0,0 +1,17 @@
+'use strict';
+const {createFramedChannel}=require('../../apps/network-broker/framed-channel.cjs');
+const channel=createFramedChannel({readable:process.stdin,writable:process.stdout,inboundFirstLimit:2097152});
+channel.once('disconnect',()=>process.exit(0));
+let context;
+channel.on('message',message=>{
+ if(message.type==='start'){
+  context={version:1,generation:message.generation,policyVersion:message.policyVersion};
+  if(message.config.malformed){process.stdout.write(Buffer.from([1,0,0,0,0xff]));return;}
+  channel.send({type:'ready',...context,authMode:'basic',sequence:0,port:message.config.port,credentials:{username:'safetynet-'+'a'.repeat(32),password:'b'.repeat(43)}},error=>{
+   if(error)process.exit(2);
+   if(message.config.audit){const id='12345678-1234-4234-8234-123456789abc';channel.send({type:'audit',...context,sequence:1,requestId:id,event:{eventId:id,kind:'upload.authorized',ruleId:'broker-approved',policyVersion:context.policyVersion,request:{bytes:0,detectedType:'text'}}});}
+  });
+ }else if(message.type==='audit-receipt'){
+  if(message.receipt?.persisted!==true||message.receipt.eventId!==message.requestId)process.exit(3);
+ }else process.exit(4);
+});