fix(thermoelastic2d): align column names with v1 dataset

[mkeeler43]

Summary

• Rename volfrac → volume_fraction_target in Conditions dataclass and fea_model.py to match the v1 HuggingFace dataset column name
• Rename volume_fraction → volume_fraction_error in objectives tuple and all fea_model.py return dicts to match the v1 dataset

Test plan

• Verified conditions_keys all exist in thermoelastic_2d_v1 dataset columns
• Verified objectives names all exist in thermoelastic_2d_v1 dataset columns
• Ran simulate() successfully on a random design from the dataset
• Ran optimize() successfully with max_iter=5

🤖 Generated with Claude Code

[Copilot]

Pull request overview

Aligns thermoelastic2d v0 problem input/output field names with the v1 HuggingFace dataset schema, so dataset-driven configs and objective columns match simulator/optimizer expectations.

Changes:

• Renamed condition key volfrac → volume_fraction_target in ThermoElastic2D.Conditions and FeaModel.run() boundary-condition parsing.
• Renamed objective/result key volume_fraction → volume_fraction_error across objectives and returned result dicts.
• Updated the 2D FEA model’s example bcs to use the new key name.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 5 comments.

File	Description
engibench/problems/thermoelastic2d/v0.py	Updates objective name and condition field to match v1 dataset columns; updates simulate() to read the renamed result key.
engibench/problems/thermoelastic2d/model/fea_model.py	Updates expected BC key and returned result dict key to match v1 dataset columns; updates local __main__ example.

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