feat: accept YAML workflow configurations

[njzjz-bot]

Summary

• add a shared loader for JSON and YAML workflow configurations
• use it for submit, resubmit, status, showkey, download, watch, restart, and workflow-control commands
• declare PyYAML directly and document .yaml/.yml support
• require the configuration document root to be a mapping

Tests

• PYTHONPATH=tests python -m unittest -v tests.entrypoint.test_common tests.entrypoint.test_argparse
• ruff format --check on changed Python files
• isort --check-only on changed Python files
• parsed pyproject.toml and verified the PyYAML dependency
• git diff --check

Closes #94

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 bd8f0d0.

📒 Files selected for processing (6)

• docs/quickcli.md
• dpgen2/entrypoint/common.py
• dpgen2/entrypoint/main.py
• dpgen2/entrypoint/workflow.py
• pyproject.toml
• tests/entrypoint/test_common.py

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[codecov]

Codecov Report

❌ Patch coverage is 68.00000% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 84.57%. Comparing base (6b01f29) to head (bd8f0d0).

Files with missing lines	Patch %	Lines
dpgen2/entrypoint/main.py	38.46%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #392      +/-   ##
==========================================
+ Coverage   84.43%   84.57%   +0.13%     
==========================================
  Files         104      104              
  Lines        6110     6112       +2     
==========================================
+ Hits         5159     5169      +10     
+ Misses        951      943       -8     

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