Feature/auditability scoring rubric

[pathankhansalman]

Summary

One or two sentences. What changes and why.

Spec impact

• No change to docs/SPEC.md.
• Editorial change to docs/SPEC.md (no behavioral change).
• Normative change to docs/SPEC.md. List affected sections below.

If this is a normative change, describe:

• What invariant or field is added, removed, or changed.
• Whether previously valid records may now be rejected, or vice versa.
• The corresponding CHANGELOG.md entry.

Validation and testing

• schema/drp.schema.json updated if the machine-checkable shape changed.
• tools/drp_validator.py updated if a new invariant was introduced.
• Positive fixture(s) added under fixtures/valid/.
• Negative fixture(s) added under fixtures/invalid/.
• Tests added or updated under tests/.
• python3 -m pytest tests/ passes locally.

Breaking change?

• No. Strictly additive or editorial.
• Yes. Explain why it is necessary and how consumers migrate.

Checklist

• Branch is up to date with main.
• CHANGELOG.md updated under [Unreleased].
• VERSION updated if this PR cuts a release.
• No new runtime dependencies added to the reference validator.

[safal207]

This is a strong and thoughtful first research contribution — thank you. The distinction between validation and scoring is especially useful, and the 8-dimension rubric gives DRP a credible path toward measurable auditability.

Before merge, please make these focused changes:

1. Remove the CONTRIBUTING.md change from this PR. A contributor path has already been merged into main, so this part now duplicates existing content. This PR should stay focused on docs/AUDITABILITY_SCORING.md.

2. Add explicit N/A handling and normalized scoring. Some dimensions do not apply to every record. For example, a root decision may have no parent links, and a decision that replaces nothing should not be penalized for missing supersession. Please define the final score as earned points / applicable maximum × 100 and explain when a dimension is marked N/A.

3. Update the PR description. Please replace the template text with a short summary, mark this as a documentation/research change with no protocol semantics change, and include Closes #21.

Small cleanup:

• fix Breath of alternatives to Breadth of alternatives in the summary table;
• make clear that automated or NLP checks are proposed future implementations, not guarantees of the current repository.

Once these are addressed, I will re-review quickly. This is valuable work and I would like to get it merged.