docs: explain runtime package signature skew

[njzjz-bot]

Summary

• explain that optional_parameter is generated internally rather than configured by users
• identify submission/runtime DPGEN2 version skew as the source of the missing-key failure
• document pinned runtime versions and upload_python_packages for local checkouts
• clarify that affected workflows must be resubmitted after alignment

Tests

• ruff format --check dpgen2/entrypoint/args.py
• isort --check-only dpgen2/entrypoint/args.py
• git diff --check

Closes #321

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 efbcd78.

📒 Files selected for processing (2)

• docs/quickcli.md
• dpgen2/entrypoint/args.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 (efbcd78).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #398   +/-   ##
=======================================
  Coverage   84.43%   84.43%           
=======================================
  Files         104      104           
  Lines        6110     6110           
=======================================
  Hits         5159     5159           
  Misses        951      951           

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