Fix packageMeta race condition: scan in-memory bundle instead of disk

[Copilot]

packageMeta()'s generateBundle hook scanned dist/packages from disk to build ember-addon.renamed-modules. Since generateBundle fires before rollup writes files to disk, and dist/dist-prod are gitignored, a fresh CI build always produced renamed-modules: {} — causing @embroider/vite to have no module redirects and the benchmark app's vite build to fail with handleInvalidResolvedId.

The main branch accidentally worked because packageMeta ran on two sequential configs; the second run's generateBundle fired after the first config had already written its files to disk. The race condition fix (running packageMeta only once on config 1) broke that accidental timing dependency.

Fix

Scan the in-memory bundle parameter of generateBundle instead of the filesystem:

// Before: disk scan — empty on fresh CI build
generateBundle() {
  glob.sync('packages/**/*.js', { cwd: 'dist', nodir: true })
    .filter(...)
}

// After: in-memory bundle — always correct, works on fresh builds
generateBundle(_outputOptions, bundle) {
  Object.keys(bundle)
    .filter(name =>
      name.startsWith('packages/') &&
      !name.startsWith('packages/shared-chunks/') &&
      name.endsWith('.js')
    )
}

pruneEmptyBundles already runs before packageMeta and mutates the shared bundle object in-place, so pruned entries are correctly excluded.

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