Expose DedicatedWorkerGlobalScope identity in worker realms

[wieslawsoltes]

Problem

The packaged Code OSS 1.137.0 AppScene audit reaches Monaco worker startup, then logs these events at the same timestamp:

Could not create web worker(s). Falling back to loading web worker code in main thread...
Unhandled promise rejection: Uncaught TypeError: Unable to resolve bare module specifier: module

Evidence is in artifacts/release-ad89179-feature-audit/stderr.log, sequences 34-37.

This is a generic worker-global compatibility gap. Code OSS src/vs/amdX.ts detects a worker with:

typeof self === 'object' && self.constructor &&
  self.constructor.name === 'DedicatedWorkerGlobalScope'

WebScene creates a real isolated worker runtime and assigns self to the global object, but does not install the browser WorkerGlobalScope / DedicatedWorkerGlobalScope identity. Code OSS therefore chooses _nodeJSLoadScript() instead of _workerLoadScript() and runs import('module'). WebScene correctly rejects that bare Node builtin, which masks the primary worker-global identity failure and causes Monaco to report worker startup failure.

Proposed fix

• Give dedicated-worker globals browser-compatible WorkerGlobalScope and DedicatedWorkerGlobalScope constructor/prototype identity, including self.constructor.name === 'DedicatedWorkerGlobalScope' and self instanceof DedicatedWorkerGlobalScope.
• Preserve the isolated worker runtime, EventTarget behavior, module loading, and bounded message queues.
• Add a Code OSS-shaped WPT/regression that makes the same loader selection and proves the worker branch runs.
• Run the existing worker throughput and queue bounds gates to confirm no performance regression.

Acceptance

• A module worker reports the expected DedicatedWorkerGlobalScope identity.
• Code OSS-shaped worker detection selects its dynamic URL import path rather than the Node builtin path.
• Existing worker/iframe, structured clone, termination, throughput, and capacity tests remain green.
• Rebuilt packaged Code OSS no longer emits the paired Monaco fallback / bare module diagnostic.

Related to #81, but independently testable as worker-global API identity.

[wieslawsoltes]

Draft PR #110 implements the focused fix from consolidation head 862c75ed.

The regression is a direct before/after reproducer:

• Prior runtime + new module-worker-clone contract: 0/1 documents, 7/8 assertions, with exact runner message TypeError: Unable to resolve bare module specifier: module.
• Patched runtime: 1/1 document, 10/10 assertions.

The worker fixture uses Code OSS's exact self.constructor.name === 'DedicatedWorkerGlobalScope' decision and selects import('module') on the incorrect branch. The runtime now supplies the dedicated/worker/EventTarget interface chain, string tag, and illegal-constructor behavior.

Local validation: full portable native CTest 26/26; Aureon candidate profile 6/6 documents and 32/32 assertions; hybrid worker suite 1.32s with the retained 10,000-message throughput and queue-capacity gates.