docs: describe workflow artifact downloads

[njzjz-bot]

Summary

• document the CLI for downloading training, exploration, and labeling results
• show iteration, artifact, prefix, and checkpoint controls
• clarify the on-disk result layout and supported artifact groups
• cover parsing a representative filtered download command

Tests

• PYTHONPATH=tests python -m unittest -v tests.entrypoint.test_argparse
• ruff format --check dpgen2/entrypoint/main.py tests/entrypoint/test_argparse.py
• isort --check-only dpgen2/entrypoint/main.py tests/entrypoint/test_argparse.py
• git diff --check

Closes #58

Coding agent: Codex
Codex version: codex-cli 0.149.0
Model: gpt-5.6-sol
Reasoning effort: xhigh

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📥 Commits

Reviewing files that changed from the base of the PR and between 6b01f29 and 21d0b9a.

📒 Files selected for processing (3)

• docs/quickcli.md
• dpgen2/entrypoint/main.py
• tests/entrypoint/test_argparse.py

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.43%. Comparing base (6b01f29) to head (21d0b9a).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #395   +/-   ##
=======================================
  Coverage   84.43%   84.43%           
=======================================
  Files         104      104           
  Lines        6110     6110           
=======================================
  Hits         5159     5159           
  Misses        951      951           

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