fix: exit gracefully when no files found

[kompre]

Summary

Changes CLI behavior to exit with code 0 instead of 1 when no files are found to process. This treats "no work to do" as a valid state rather than an error condition.

Changes

• quarto_batch_convert.py (lines 301-303, 321-326)

  • Replace ctx.exit(1) with return for graceful exit
  • Remove "Error:" prefix from messages

• test_quarto_batch_convert.py (test_no_match_found)

  • Update to expect exit code 0 instead of 1
  • Update docstring to reflect graceful behavior

Rationale

• No files to process is not an error - it's a valid state where there's no work to do
• Prevents failure of CI/CD pipelines and automated scripts when no matching files exist
• Consistent with Unix tools (grep, find) that exit 0 on no matches

Testing

✅ All 17 tests pass

• test_no_match_found now validates exit code 0
• All other tests remain passing

Test Scenarios Covered

1. Empty directory with -r flag
2. Directory with files but wrong extension
3. Regex pattern that matches no files
4. Non-existent glob pattern

All scenarios now exit with code 0 and informative (non-error) message.

🤖 Generated with Claude Code