Rename task_data to environment_data in tests, examples, and docs

[cemde]

Description

Eliminates confusing task_data naming in tests and examples where the value is actually environment_data. The production code (base class + all 6 environments + all benchmark instantiations) already uses environment_data consistently — this PR fixes tests, fixtures, and examples that still used the old naming.

Also fixes a bug in MACS real_data tests where {"environment_data": task.environment_data} wrapped environment_data in an extra dict, causing setup_state to silently get tools=[] via .get("tools", []).

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Code quality improvement (refactoring, formatting, etc.)

Checklist

Contribution

• I have read the CONTRIBUTING.md guide.
• Commits follow "How to write a good git commit message"

Documentation

• Added/updated docstrings for new/modified functions as instructed CONTRIBUTING.md
• Updated relevant documentation in docs/ (if applicable)
• Tag github issue with this PR (if applicable)

Changelog

• Added entry to CHANGELOG.md under [Unreleased] section
• OR this is a documentation-only change (no changelog needed)

Architecture (if applicable)

• Core/Interface separation: Changes in maseval/core/ do NOT import from maseval/interface/
• Dependencies: New core dependencies added sparingly; framework integrations go to optional dependencies

Additional Notes

• 2541 tests pass, just all clean
• Remaining task_data references in multiagentbench are intentional (refers to the "task" sub-field of environment_data, a different concept)

[github-actions]

Coverage report

Click to see where and how coverage changed

File	Statements	Missing	Coverage	Coverage (new stmts)	Lines missing
maseval/benchmark/converse
converse.py
environment.py
maseval/benchmark/gaia2
environment.py
gaia2.py
maseval/benchmark/macs
macs.py
maseval/benchmark/mmlu
mmlu.py					109
maseval/benchmark/multiagentbench
environment.py					92
multiagentbench.py
maseval/benchmark/tau2
environment.py					91
tau2.py
maseval/core
environment.py
Project Total

This report was generated by python-coverage-comment-action

[cemde]

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