docs(skills): refresh ADR standards references

[Tomomi Chen (tomomi-code)]

Description

Refreshed the ADR standards reference after reviewing its current contracts and upstream sources:

• Aligned MADR and Y-Statement descriptions with the current output-template contract.
• Added canonical source links, clarified citation-only handling, and updated the review date.

Related Issue(s)

Fixes #2585

Type of Change

• Documentation update

Sample Prompts (for AI Artifact Contributions)

Not applicable. This change updates supporting reference documentation only.

Testing

• Passed npm run validate:docs, npm run spell-check, frontmatter validation, and skill validation.
• Passed targeted link validation for the changed file.

Checklist

Required Checks

• Documentation is updated (if applicable)
• Files follow existing naming conventions
• Changes are backwards compatible (if applicable)
• Tests added for new functionality (N/A: no functionality changed)

Required Local Checks

The following local-safe validation commands must pass before merging:

• Local validation aggregate: npm run validate:local
• Documentation validation (if docs changed): npm run validate:docs
• Spell checking: npm run spell-check
• Link validation: npm run lint:md-links

Security Considerations

• This PR does not contain any sensitive or NDA information

Additional Notes

npm run validate:local and the full link check are blocked by an unrelated link failure in .github/skills/project-planning/security-planning/references/data-classification.md.

[Codecov Comments Bot (codecov-commenter)]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.06%. Comparing base (68308dd) to head (52d34ab).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2761      +/-   ##
==========================================
- Coverage   83.08%   83.06%   -0.03%     
==========================================
  Files         183      169      -14     
  Lines       33712    32880     -832     
  Branches       25        0      -25     
==========================================
- Hits        28010    27312     -698     
+ Misses       5699     5568     -131     
+ Partials        3        0       -3     

Flag	Coverage Δ
docusaurus	?
pester	83.87% <ø> (+0.05%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.
see 24 files with indirect coverage changes

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.