feat: integrate room framework and isolated subgame bundles

Complete room UI and protocol integration, move game definitions and resources behind bundle entries, publish authoritative version XML, and document single-game builds. Include all current resource changes and experiment artifacts.

out/single-game-bundle-probe-20260909/project/extensions/probe-build/builder.js

@@ -0,0 +1 @@
+exports.configs={'web-mobile':{hooks:'./hooks'}};

out/single-game-bundle-probe-20260909/project/extensions/probe-build/hooks.js

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+const fs=require('fs'),path=require('path');exports.throwError=true;
+
+exports.onAfterBuild=(options,result)=>{const key=options.outputName.endsWith('beta')?'beta':'alpha';
+ fs.writeFileSync(path.join(result.paths.output,'target.json'),JSON.stringify({bundle:'game-'+key,entry:'ProbeEntry_'+key,otherEntry:'ProbeEntry_'+(key==='alpha'?'beta':'alpha')}));
+ fs.writeFileSync(path.join(result.paths.output,'probe-build.json'),JSON.stringify({bundles:result.settings.assets.projectBundles,options:options.bundleConfigs},null,2));
+};
+

out/single-game-bundle-probe-20260909/project/extensions/probe-build/package.json

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+{"name":"probe-build","package_version":2,"version":"1.0.0","contributions":{"builder":"./builder.js"}}