feat: add pull request template with traceability table and update RE…

[iamdikko]

Closes #471
…ADME documentation

Summary

Closes #

Test Plan and Evidence

Self-Assessment

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• Scope: The change matches the linked issue and contains no unrelated
  or unfinished work.
• Tests: Appropriate automated and manual evidence is included above,
  or a no-test justification is provided.
• CI: Relevant local checks pass and required CI checks pass on the
  latest commit.
• Documentation: Affected documentation, comments, examples,
  screenshots, and links are updated, or no update is needed.
• Known limitations: Limitations, assumptions, risks, skipped checks,
  and follow-up work are disclosed below.
• Acceptance criteria: Each issue criterion is mapped to implementation
  or verification evidence below.

CI Status

Documentation

Known Limitations

Acceptance Criteria

Acceptance criterion	Implementation or evidence	Status
		Pass / Not applicable

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