Conditionally import legacy-inspector-support per ember-source version

The min-supported try-scenario was failing with:

    [vite]: Rollup failed to resolve import "@ember/enumerable/mutable"
    from ".../@embroider/legacy-inspector-support/src/modules-4-12.js"

`@embroider/legacy-inspector-support` ships three entry points sharded by
ember-source range:
  - ember-source-3.28  → Ember < 4.8   (uses legacy mutable-enumerable path)
  - ember-source-4.8   → Ember 4.8–4.11 (adds @ember/enumerable/mutable)
  - ember-source-4.12  → Ember >= 4.12 (also adds @ember/owner)

test-app/app/app.js was hard-coded to the 4.12 entry, so the min-supported
scenario (ember-source ~4.2.0) pulled in modules-4-12.js, which imports
`@ember/enumerable/mutable` — a module that doesn't exist in Ember 4.2.

Use macroCondition + dependencySatisfies + importSync from @embroider/macros
to pick the right entry at build time based on the installed ember-source.
The macros compile the untaken branches away, so each try scenario only
pulls in the import graph it can actually resolve.

Co-Authored-By: Claude Opus 4.7 (1M context) <[email protected]>

Author: NullVoxPopuli

test-app/app/app.js

@@ -1,8 +1,26 @@
 import Application from 'ember-strict-application-resolver';
 import { entries as serviceEntries } from 'ember-page-title/service-registry';
 import { entries as templateEntries } from 'ember-page-title/template-registry';
+import {
+  dependencySatisfies,
+  importSync,
+  macroCondition,
+} from '@embroider/macros';
 
-import setupInspector from "@embroider/legacy-inspector-support/ember-source-4.12";
+let setupInspector;
+if (macroCondition(dependencySatisfies('ember-source', '>= 4.12.0'))) {
+  setupInspector = importSync(
+    '@embroider/legacy-inspector-support/ember-source-4.12',
+  ).default;
+} else if (macroCondition(dependencySatisfies('ember-source', '>= 4.8.0'))) {
+  setupInspector = importSync(
+    '@embroider/legacy-inspector-support/ember-source-4.8',
+  ).default;
+} else {
+  setupInspector = importSync(
+    '@embroider/legacy-inspector-support/ember-source-3.28',
+  ).default;
+}
 
 export default class App extends Application {
   inspector = setupInspector(this);