chore: deprecate validateElementAgainstReferences()

[cjbarth]

Summary

validateElementAgainstReferences() compares an element's digest with the references of a loaded signature. A digest match says nothing about whether the signature verifies, so the method duplicates getSignedReferences() in a way that is easy to misuse. It is deprecated for removal in a future major. The replacement is to consume the XML that getSignedReferences() returns after checkSignature() succeeds, instead of nodes from the original document.

• Runtime warning: util.deprecate warning with code XML_CRYPTO_VALIDATE_ELEMENT_AGAINST_REFERENCES, following the getOriginalXmlWithIds() pattern.
• JSDoc: @deprecated tag naming the replacement.
• README: the verification method list now includes getSignedReferences() and marks validateElementAgainstReferences() as deprecated.
• Tests: the existing test call to the method stays, behind a deprecation/deprecation suppression, until the method is removed.

#571 (v7.0) adds validateElementAgainstReferencesAsync(). That twin should be dropped from #571 rather than added and then removed.

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📝 Walkthrough

Walkthrough

The PR deprecates validateElementAgainstReferences(). The method keeps its existing validation behavior and now emits a warning. Documentation identifies getSignedReferences() as the replacement. The affected test suppresses the deprecation lint warning.

Changes

Element reference validation deprecation

Layer / File(s)	Summary
Deprecation warning and API guidance src/signed-xml.ts, README.md, test/signature-unit-tests.spec.ts	validateElementAgainstReferences() now emits a deprecation warning. Documentation recommends getSignedReferences() after successful verification. The test suppresses the related deprecation lint warning.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~5 minutes

Change: Other

Suggested reviewers: shunkica

Merge Risk: 🔵 Low · up to 05e02

The remaining deprecated test dependency does not affect production behavior but should be removed to complete the intended cleanup.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 1 functions across 2 files. (1 skipped: 1 …	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely identifies the main change: deprecating validateElementAgainstReferences().

Full details: Docstring Coverage

Explanation

Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 1 functions across 2 files. (1 skipped: 1 unsupported.)

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.78%. Comparing base (f5c4d22) to head (05e0269).
⚠️ Report is 18 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #592      +/-   ##
==========================================
+ Coverage   75.95%   79.78%   +3.83%     
==========================================
  Files           9        9              
  Lines        1048     1118      +70     
  Branches      273      283      +10     
==========================================
+ Hits          796      892      +96     
+ Misses        144      129      -15     
+ Partials      108       97      -11     

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Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

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Inline comments:
In `@test/signature-unit-tests.spec.ts`:
- Line 914: In the test containing validateElementAgainstReferences(), remove
that deprecated API call and its assertion, along with the deprecation
suppression. Preserve getSignedReferences() as the replacement coverage.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Advanced

Run ID: 610af5a7-ec7e-404c-a274-ea9ef250b52e

📥 Commits

Reviewing files that changed from the base of the PR and between b901469 and 05e0269.

📒 Files selected for processing (3)

• README.md
• src/signed-xml.ts
• test/signature-unit-tests.spec.ts

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