refactor(core): type createIdentityTagger's frameworkName as FrameworkName

The enum was decorative for the framework packages: they passed a member into a
plain `string` parameter, so nothing stopped a package inventing its own value
for the attribute the backend keys off. Typing it closes that.

Verified the constraint bites: passing 'Vue' now fails with
"Type '"Vue"' is not assignable to type 'FrameworkName'. Did you mean '"vue"'?"

Author: DriesH

packages/core/src/util/createIdentityTagger.ts

@@ -1,3 +1,4 @@
+import type { FrameworkName } from '../framework';
 import type { Framework, SdkInfo } from '../types';
 
 /** Minimal surface the tagger needs; the browser Flare and any subclass satisfy it structurally. */
@@ -10,7 +11,12 @@ export interface SdkTaggable {
  * Builds a per-package SDK/framework identity tagger. Holds its own WeakSet guards so each Flare
  * instance (singleton or injected renderer) is tagged at most once, on each of the two axes.
  */
-export function createIdentityTagger(config: { sdkName: string; sdkVersion: string; frameworkName: string }): {
+/**
+ * `frameworkName` is typed as `FrameworkName`, not `string`: this is the wire vocabulary the backend
+ * keys off, so a first-party package cannot invent a value here. A host app that genuinely needs its
+ * own name calls `setFramework` directly.
+ */
+export function createIdentityTagger(config: { sdkName: string; sdkVersion: string; frameworkName: FrameworkName }): {
     registerSdkIdentity(flare: SdkTaggable): void;
     tagFramework(flare: SdkTaggable, frameworkVersion?: string): void;
 } {