Return non-zero exit code when download errors occur with --ignore-errors

[Copilot]

The download command returns exit code 0 even when errors are logged, preventing scripts from detecting failures when using --ignore-errors.

Changes

• Error tracking: Added _errors counter to DownloadCounter class with count_error() method
• Error capture points:
  • consume(): exceptions during async download tasks
  • download_cover(): missing cover URLs
  • ASIN/title lookup failures
• Exit code: Return 1 when counter.errors > 0 at end of download command

Behavior

# Before: exit 0 despite errors
$ audible download --aaxc --asin INVALID --ignore-errors
ERROR: Skip asin INVALID: Not found in library
$ echo $?
0

# After: exit 1 signals failure
$ audible download --aaxc --asin INVALID --ignore-errors
ERROR: Skip asin INVALID: Not found in library
$ echo $?
1

Without --ignore-errors, behavior unchanged (exception → exit 1/2). Successful downloads still exit 0.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Exitcodes: Non-0 exitcode for runs with errors</issue_title>
<issue_description>Hi!

I am using audible-cli in a bunch of scripts. Sometimes downloads are not possible and error out.

When that happens, i do get a log-line "Error: xyz", but the exit code is still 0.

It would be helpful for scripting if the errorcode could convey more information about that. I'd like a non-zero errorcode at the minimum if errors did occur at all.

Thanks!</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Exitcodes: Non-0 exitcode for runs with errors #256

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