fix: declare jsonpickle runtime dependency

[njzjz-bot]

Summary

• add jsonpickle to the declared runtime dependencies
• ensure clean installs can import workflow modules without relying on transitive packages

Tests

• parsed pyproject.toml with tomllib and verified jsonpickle is declared
• imported dpgen2.flow.dpgen_loop
• git diff --check

Closes #359

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 b05af11 and e6fef24.

📒 Files selected for processing (1)

• pyproject.toml

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.19%. Comparing base (fa4a4cf) to head (e6fef24).
⚠️ Report is 109 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #385      +/-   ##
==========================================
- Coverage   85.61%   84.19%   -1.42%     
==========================================
  Files          92      104      +12     
  Lines        4852     6107    +1255     
==========================================
+ Hits         4154     5142     +988     
- Misses        698      965     +267     

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