feat(fls): keep a .fls's own applications through the editor model

The archive's entries besides the configuration — the project's own Java
applications under projekt/anwendungen (.java, .class,
EigeneAnwendungen.txt) — now go through the editor model:
openProjectArchive reads a whole .fls into the model and keeps them in its
archiveEntries, saveProjectArchive writes a whole .fls from the model with
them unchanged. They cannot run here, but must not be lost.

Checked on every corpus file: each entry comes back byte for byte (7 files
carry applications of their own); a probe that drops them is caught.
Installing such applications on a host is the next step; Java loads those
only through its full loading path, which the oracle is to use first.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

packages/fls/test/exportProject.test.ts

@@ -30,7 +30,9 @@ import {
   exportProject,
   importProject,
   javaBase64,
+  openProjectArchive,
   readFlsArchive,
+  saveProjectArchive,
   readTopology,
   writeFlsArchive,
   type FlsFileTree,
@@ -324,10 +326,13 @@ describe('the editor model exported, as Java loads it', () => {
   for (const file of flsFiles(corpusRoot)) {
     const name = relative(corpusRoot, file);
     it(name, () => {
-      const topology = readTopology(decodeJavaBeans(readFlsArchive(new Uint8Array(readFileSync(file))).configurationXml));
-      const project = importProject(topology, counter());
+      const bytes = new Uint8Array(readFileSync(file));
+      const topology = readTopology(decodeJavaBeans(readFlsArchive(bytes).configurationXml));
+      const project = openProjectArchive(bytes, counter());
       const { topology: toWrite } = exportProject(project);
-      const archive = writeFlsArchive(new TextEncoder().encode(writeTopologyXml(toWrite)));
+      const { archive } = saveProjectArchive(project);
+      // The project's own applications, and every other entry, byte for byte.
+      expect(readFlsArchive(archive).supplementalEntries).toEqual(readFlsArchive(bytes).supplementalEntries);
       if (process.env.UPDATE_EXPORTED === '1') {
         mkdirSync(dirname(join(exportedRoot, name)), { recursive: true });
         writeFileSync(join(exportedRoot, name), archive);