test: declare test runner dependencies

[njzjz-bot]

Summary

• add coverage, mock, and pytest to the test extra
• keep existing test-only packages in that extra
• remove the separate CI-only installation so contributors and CI use the same dependency contract

jsonpickle is a runtime import and is declared separately by PR #385 for issue #359.

Tests

• parsed pyproject.toml with tomllib and verified the direct test dependencies
• parsed .github/workflows/test.yml with PyYAML
• git diff --check

Closes #362

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 fb8c9e3.

📒 Files selected for processing (2)

• .github/workflows/test.yml
• pyproject.toml

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.42%. Comparing base (6b01f29) to head (fb8c9e3).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #388      +/-   ##
==========================================
- Coverage   84.43%   84.42%   -0.01%     
==========================================
  Files         104      104              
  Lines        6110     6107       -3     
==========================================
- Hits         5159     5156       -3     
  Misses        951      951              

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