Add weighted rubric MAE using metadata point values

[andrewpbray]

• Add scores_from_metadata() helper to extract rubric scores from JSON
• Add weights argument to rubric_mae() and find_differences()
• Update compute_mae_and_isp() to accept optional metadata_file
• Add tests for weighted MAE and scores_from_metadata()

[Copilot]

Pull request overview

This PR adds support for computing a point-weighted rubric MAE by using rubric item point values from a metadata JSON file, and exposes a helper to extract those scores for reuse across the package.

Changes:

• Added scores_from_metadata() to read rubric point values from metadata JSON.
• Extended rubric_mae() / find_differences() to accept optional weights for weighted MAE.
• Updated compute_mae_and_isp() to optionally load weights from metadata_file, and added tests covering weighted MAE + metadata score extraction.

Reviewed changes

Copilot reviewed 3 out of 6 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
tests/testthat/test-computing-accuracy.R	Adds tests for weighted MAE and scores_from_metadata().
R/computing-accuracy.R	Implements scores_from_metadata(), threads weights through MAE computation, updates docs.
NAMESPACE	Exports scores_from_metadata().
man/scores_from_metadata.Rd	New generated documentation for scores_from_metadata().
man/rubric_mae.Rd	Documents the new weights parameter and weighted behavior.
man/compute_mae_and_isp.Rd	Documents new metadata_file parameter and weighted MAE behavior.

Files not reviewed (3)

• man/compute_mae_and_isp.Rd: Language not supported
• man/rubric_mae.Rd: Language not supported
• man/scores_from_metadata.Rd: Language not supported

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