Fix CLI quirks: blocking_mode, config errors, NOOP report crash, Python name matching

[ivanklee86]

Summary

Fixes six quirks found while documenting the codebase. Each fix is its own commit with a regression test.

• Terminal report crash on NOOP results: NOOP rows were included in the violations table without result text, which caused an UnboundLocalError or stale text. Only WARN and BLOCK results are listed now, the same as the GitHub report.
• Invalid config in grade: the ValidationError was printed, then the command crashed with a NameError. grade and configs validate now share load_config(), which exits with code 1. print_error is typed NoReturn.
• Debug env var typo: RUBRICAL_DEBUG now works, and RUBGRICAL_DEBUG is still accepted for backwards compatibility.
• blocking_mode was ignored: --block/--no-block now defaults to the config's blocking_mode (default true) and overrides it when given. If blocks are found while blocking is off, rubrical says so instead of printing "All dependencies up to date!".
• Python name matching: config names are matched against Python dependencies using PEP 503 normalization, so mopidy_dirble matches Mopidy-Dirble. Other package managers keep exact matching through a new BasePackageManager.normalize_name hook.
• Stray string: removed a leftover test-output string at the end of rubrical/rubrical.py.

Behavior changes

• Setting blocking_mode: false in a config now changes the exit code. Previously the setting had no effect.
• blocking_mode: null now fails validation, because the field is now bool.
• Some Python config entries that differed only in case or separators will now match and may produce new warnings or blocks.

Testing

• task python:lint and task python:test pass (44 passed, 4 skipped; the skipped tests are the GitHub tests, which need a token).
• mkdocs build --strict passes. docs/commands.md was regenerated and docs/configuration.md updated.

🤖 Generated with Claude Code

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