Release/v0.1.1

[chris-colinsky]

Summary

Adds derived throughput metrics to the parallel pipeline's combined report, improves Slack
notification detail, and delivers a round of internal refactoring focused on exception handling and
code clarity.

Changes

• combined_report.json gains four derived metrics: avg_time_per_file_seconds,
  avg_time_per_mb_seconds, processing_speed_ratio (real-time factor), and words_per_audio_hour
• Slack notifications now include per-stage stats and average processing time per file
• Dockerfile + .dockerignore for containerized deployment
• Centralized Demucs scratch directory handling in CLI
• Exception handling narrowed in gpu_utils.py, transcriber.py, notifier.py

See CHANGELOG.md for full details.

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing behavior to change)
• Documentation update

Testing

• Unit tests pass: make test
• All checks pass: make all-checks
• New tests added for new functionality
• Integration tests verified (if applicable — requires GPU)

Checklist

• Code follows the project style (ruff lint + format clean)
• CHANGELOG.md updated under [Unreleased]
• Documentation updated if CLI options or behavior changed
• No new dependency pins added without explanation

Related Issues

Closes #