Feat: support pressure task

[anyangml]

This PR support a downsampled test from Antoine Loew et al 2026 J. Phys. Mater. 9 015010 Universal machine learning potentials under pressure

[codecov]

Codecov Report

❌ Patch coverage is 0% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 64.89%. Comparing base (318c77a) to head (8d2088a).
⚠️ Report is 12 commits behind head on main.

Files with missing lines	Patch %	Lines
lambench/models/ase_models.py	0.00%	6 Missing ⚠️

Additional details and impacted files

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- Coverage   65.13%   64.89%   -0.24%     
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  Files          35       35              
  Lines        1635     1641       +6     
  Branches      201      202       +1     
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  Hits         1065     1065              
- Misses        526      532       +6     
  Partials       44       44              

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[Copilot]

Pull request overview

Adds a new “pressure” calculator task to evaluate LAM volume predictions under elevated pressure using a downsampled dataset from Loew et al. (2026).

Changes:

• Introduces a new pressure calculator task implementation and wires it into ASEModel.evaluate.
• Adds task configuration (test data path + relaxation params) and includes the task in post-processing/metrics configs.
• Extends results metadata + documentation to describe the new benchmark task.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
lambench/tasks/calculator/pressure/pressure.py	Implements the pressure-volume evaluation by relaxing structures under target pressure and comparing per-atom volumes.
lambench/tasks/calculator/calculator_tasks.yml	Registers the new pressure task and its parameters (fmax/max_steps).
lambench/models/ase_models.py	Routes task_name == "pressure" to the new inference implementation.
lambench/metrics/results/metadata.json	Adds display/description/metric metadata for the new task.
lambench/metrics/results/README.md	Updates the changelog-style “Updates” section to mention the new task.
lambench/metrics/post_process.py	Includes pressure in domain-specific results aggregation.
lambench/metrics/downstream_tasks_metrics.yml	Adds scoring config entry for pressure (MAE + dummy baseline).

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