Feat: add stacking fault task

[anyangml]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 64.74%. Comparing base (8d2088a) to head (90740ed).
⚠️ Report is 9 commits behind head on main.

Files with missing lines	Patch %	Lines
lambench/models/ase_models.py	0.00%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #397      +/-   ##
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- Coverage   64.89%   64.74%   -0.16%     
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  Files          35       35              
  Lines        1641     1645       +4     
  Branches      202      203       +1     
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  Hits         1065     1065              
- Misses        532      536       +4     
  Partials       44       44              

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[Copilot]

Pull request overview

Adds a new calculator benchmark task for stacking-fault energy evaluation and integrates it into the task/metrics pipelines.

Changes:

• Introduces a new stacking_fault calculator task that reads sliding trajectories + CSV labels and reports MAE_E and MAE_dE.
• Adds PCHIP-based interpolation utility for smoothing/resampling energy profiles.
• Registers the new task in calculator task config, model evaluation dispatch, and metrics metadata/post-processing.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 9 comments.

Show a summary per file

File	Description
lambench/tasks/calculator/stacking_fault/utils.py	Adds PCHIP interpolation helper used by stacking-fault metrics.
lambench/tasks/calculator/stacking_fault/stacking_fault.py	Implements stacking-fault inference and metric computation.
lambench/tasks/calculator/calculator_tasks.yml	Registers stacking_fault test-data location and params.
lambench/models/ase_models.py	Dispatches the new task; also changes MACE head selection for inorganic domain.
lambench/metrics/results/metadata.json	Adds display/description entries for stacking-fault metrics.
lambench/metrics/post_process.py	Includes stacking_fault in domain-specific post-processing.
lambench/metrics/downstream_tasks_metrics.yml	Adds stacking-fault to downstream task metrics config (metrics + dummy).

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