Quiet default CLI progress output

[morehardy]

Summary

• Hide internal observability step names in default CLI progress while preserving them in --verbose output.
• Suppress Hugging Face download progress during model loading unless explicitly enabled.
• Add regression coverage for quiet progress, finalizing state, and model progress suppression behavior.

Test Plan

• uv run python -m unittest
• git diff --check

[gemini-code-assist]

Code Review

This pull request introduces a quiet mode for the console progress observer, which maps internal step names to user-friendly labels and hides specific processing steps unless the verbose flag is enabled. It also adds logic to suppress Hugging Face model download progress bars during model loading. Feedback was provided to improve the implementation of the download progress suppression by using os.environ.setdefault and simplifying the conditional logic to minimize side effects.

[gemini-code-assist]

The logic for suppressing Hugging Face download progress bars is effective, but it relies on modifying the global os.environ. While acceptable for a CLI tool, consider using os.environ.setdefault or only setting it if it's not already present to minimize side effects. Additionally, the check for explicitly_enabled could be simplified.

Suggested change

	def _suppress_model_download_progress(self) -> None:
	flag = os.environ.get("HF_HUB_DISABLE_PROGRESS_BARS")
	if flag is None:
	os.environ["HF_HUB_DISABLE_PROGRESS_BARS"] = "1"
	explicitly_enabled = False
	else:
	explicitly_enabled = flag.strip().lower() in {"0", "false", "off", "no"}
	if explicitly_enabled:
	return
	try:
	from huggingface_hub.utils import disable_progress_bars
	except ImportError:
	return
	disable_progress_bars()
	def _suppress_model_download_progress(self) -> None:
	flag = os.environ.get("HF_HUB_DISABLE_PROGRESS_BARS")
	if flag is not None and flag.strip().lower() in {"0", "false", "off", "no"}:
	return
	os.environ.setdefault("HF_HUB_DISABLE_PROGRESS_BARS", "1")
	try:
	from huggingface_hub.utils import disable_progress_bars
	disable_progress_bars()
	except ImportError:
	pass