refactor(yok): type the di bridge on IInjector

The token container was reachable only through a getter on the concrete
Yok class, so every crossing from facade-typed code into the new API
needed an any cast - the migration's most important seam was invisible
to the type system. IInjector now declares readonly di: Injector.

Author: edusperoni

lib/common/definitions/yok.d.ts

@@ -1,6 +1,7 @@
 import { IDisposable, IDictionary } from "../declarations";
 import { ICommand } from "./commands";
 import { IKeyCommand, IValidKeyName } from "./key-commands";
+import { Injector } from "../di/injector";
 
 /**
  * The legacy injector facade surface. Every member is individually
@@ -9,6 +10,13 @@ import { IKeyCommand, IValidKeyName } from "./key-commands";
  * completes.
  */
 interface IInjector extends IDisposable {
+	/**
+	 * The token-based container backing this facade — the bridge to the
+	 * new-style API. Registrations and lookups by token go here; code already
+	 * running in an injection context should prefer inject(Injector).
+	 */
+	readonly di: Injector;
+
 	/**
 	 * @deprecated Use provideLazy() from lib/common/di — the same deferred
 	 * loading, token-based.

test/compat/legacy-hooks.ts

@@ -283,7 +283,7 @@ describe("legacy hook contract", () => {
 		});
 
 		assert.strictEqual(capture.logger, testInjector.resolve("logger"));
-		assert.strictEqual(capture.container, (<any>testInjector).di);
+		assert.strictEqual(capture.container, testInjector.di);
 		assert.strictEqual(capture.hookArgs, payload);
 	});