Support inject() in application lifecycle provider callbacks

[Copilot]

Angular's inject() function only works within an injection context. While it functioned in provider factory functions, it failed when called inside lifecycle callback functions (APP_INITIALIZER, APP_BOOTSTRAP_LISTENER, ENVIRONMENT_INITIALIZER, PLATFORM_INITIALIZER) because those callbacks execute outside the injection context.

Changes

• New utility: wrapInitializerProviders intercepts lifecycle providers and wraps callbacks with runInInjectionContext() to maintain injection context during execution
• useValue support: Converts function-valued useValue providers to useFactory to access the injector
• Tests: 14 new tests covering all lifecycle providers with factory, callback, and useValue patterns
• Documentation: Comprehensive guide with examples and async boundary limitations

Usage

import { inject, APP_INITIALIZER, InjectionToken } from '@angular/core';
import { createApplicationHarness } from '@ngworker/spectacular';

const CONFIG = new InjectionToken<Config>('CONFIG');

// Now works: inject() in callback function
await createApplicationHarness({
  providers: [
    { provide: CONFIG, useValue: { apiUrl: 'https://api.example.com' } },
    {
      provide: APP_INITIALIZER,
      useFactory: () => () => {
        const config = inject(CONFIG); // Previously failed, now works
        console.log('Initializing with', config.apiUrl);
      },
      multi: true,
    },
  ],
});

Note: Injection context cannot cross async boundaries—call inject() before any await.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Support inject in application lifecycle providers</issue_title>
<issue_description>## What is the motivation/use case for changing the behavior?

Ensure that createApplicationHarness supports using inject in specified providers, in particular providers for APP_INITIALIZER, APP_BOOTSTRAP_LISTENER, ENVIRONMENT_INITIALIZER, and PLATFORM_INITIALIZER.

Describe the solution you'd like

Describe alternatives you've considered

Additional context

</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Support inject in application lifecycle providers #147

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