AccessDeniedException when scanning filesystem root due to Files.walk without error handling

[nixel2007]

Problem

When MDClasses.findFiles() (or MDClasses.createSolution()) is called with a path that is the filesystem root (/) or contains protected directories (e.g. /sys/kernel/tracing/), it throws an unhandled AccessDeniedException wrapped in UncheckedIOException:

java.io.UncheckedIOException: java.nio.file.AccessDeniedException: /sys/kernel/tracing/osnoise
  at com.github._1c_syntax.bsl.languageserver.context.ServerContext.computeConfigurationMetadata(ServerContext.java:435)
  ...

Root cause

Files.walk() propagates AccessDeniedException as an UncheckedIOException. The caller has no reasonable way to predict which paths will be inaccessible on a given OS/environment (e.g. Linux /sys, /proc, container-mounted filesystems).

Expected behavior

findFiles() / createSolution() should silently skip directories that cannot be accessed, similar to how find command behaves with -maxdepth or permission errors. This can be done by replacing Files.walk() with Files.walkFileTree() and returning FileVisitResult.CONTINUE from visitFileFailed() when the exception is an AccessDeniedException.

Suggested fix

Files.walkFileTree(root, new SimpleFileVisitor<>() {
    @Override
    public FileVisitResult visitFileFailed(Path file, IOException exc) {
        if (exc instanceof AccessDeniedException) {
            return FileVisitResult.CONTINUE; // skip inaccessible paths
        }
        throw new UncheckedIOException(exc);
    }
    // ... visitFile as before
});

Reproducer

Call MDClasses.createSolution(Path.of("/"), settings) on Linux — it will eventually hit /sys/kernel/tracing/osnoise and throw.

Observed in BSL Language Server CI on Ubuntu runners: https://github.com/1c-syntax/bsl-language-server/actions/runs/25785327480/job/75737261066