fix(jit): lower signal initializer APIs to synthesized propDecorators

[brandonroberts]

Closes #312.

Summary

• Detect property initializers calling input(), output(), outputFromObservable(), model(), viewChild()/viewChildren(), contentChild()/contentChildren() (and .required() variants) on classes carrying @Component/@Directive
• Synthesize the matching @Input/@Output/@ViewChild/etc. entries into static propDecorators so the runtime JIT facade can discover inputs, outputs, and queries
• Mirrors packages/compiler-cli/src/ngtsc/transform/jit/src/initializer_api_transforms/
• Skip synthesis when an explicit matching decorator already coexists on the field (decorator wins, matches upstream signal*Transform early-return)

Behavior changes

For a JIT-compiled class:

@Component({ selector: 'c', template: '' })
export class C {
  readonly value = input(0);
  readonly clicked = output<void>();
  readonly el = viewChild<ElementRef>('ref');
}

Before:

static propDecorators = {};
// runtime sees no inputs/outputs/queries — setInput fails (NG0315)

After:

static propDecorators = {
  value: [{ type: Input, args: [{ isSignal: true, alias: "value", required: false, transform: undefined }] }],
  clicked: [{ type: Output, args: ["clicked"] }],
  el: [{ type: ViewChild, args: ["ref", { isSignal: true }] }],
};

Notes on the upstream port

• Three call shapes recognized: bare identifier (input(...)), .required member (input.required(...)), namespaced (core.input(...))
• as/satisfies/parenthesized wrappers unwrapped, matching ngc's tryParseInitializerApi
• Argument positions match the runtime APIs:
  • input(default, options?) / model(default, options?) — options in args[1]
  • input.required(options?) / model.required(options?) — options in args[0]
  • output(options?) — options in args[0]
  • outputFromObservable(observable, options?) — options in args[1]
  • Queries — locator in args[0], options in args[1] (spread with isSignal: true folded)
• model() emits two decorators per field: @Input({isSignal, alias, required, transform: undefined}) and @Output("<alias>Change")

Test plan

• 14 new focused tests in crates/oxc_angular_compiler/tests/jit_signal_initializer_test.rs cover each API, alias-from-options, .required variants, explicit-decorator-wins precedence, and the outputFromObservable args[1] regression
• Full cargo test -p oxc_angular_compiler passes — no regressions across the existing ~1200 tests
• Reviewer to spot-check the synthesized text shape against ngc compliance fixtures if desired (e.g. packages/compiler-cli/test/compliance/test_cases/signal_inputs/)

🤖 Generated with Claude Code

[Brooooooklyn]

@codex review

[chatgpt-codex-connector]

💡 Codex Review

Here are some automated review suggestions for this pull request.

Reviewed commit: 56120e5964

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review".

If Codex has suggestions, it will comment; otherwise it will react with 👍.

Codex can also answer questions or update the PR. Try commenting "@codex address that feedback".