Implement Workstream 8: Lidarr publish command

[thomaseleff]

Summary

• add new publish CLI command for curated exact-album publishing to Lidarr
• load LIDARR_API_KEY from environment and return a friendly error when missing
• integrate Lidarr API behavior via lidarr-py in a new publish workflow module
• keep catalog behavior intact while adding subcommand support in CLI
• add integration tests for publish command flows and update docs/workstream status

Validation

• uv run ruff check .
• uv run ty check .
• uv run pytest tests/integration/test_cli.py -k publish -q

Notes

• full tests/integration/test_cli.py run appears to hang in this environment due network-dependent paths; publish-specific integration tests pass.