TextFileExposer only reads first line of version text files

In `TextFileExposer.java:55`:

```java
String line = br.readLine();
if (line != null && !line.isEmpty()) {
textVersions.add(line);
}
```

Only the first line of any version text file is used. Version files with multi-line content (e.g., `key=value` pairs, multi-line version headers) lose all data beyond line 1.

**Fix**: Read all lines in a loop:
```java
String line;
while ((line = br.readLine()) != null) {
if (!line.isEmpty()) {
textVersions.add(line);
}
}
```

Open TextFileExposer.java at line 55 and inspect how version text files are read. Verify the change with a version file containing multiple non-empty lines, ensuring every such line is preserved rather than only the first.

Written by the indexing model from the issue text.