[#4253 2/8] feat(pe): PD validators (Validate + ValidateSelectionKeys)#4281

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stevenvegt wants to merge 8 commits into

feature/4253-credential-selectionfrom

4253-2-validators

Commits on May 27, 2026

chore: scaffold draft PR for #4253 item 2 (validators)
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Commits on Jul 16, 2026

feat(pe): add ValidateSelectionKeys (Policy 1)
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feat(pe): add Validate with same-id value-set consistency (Policy 7)
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feat(pe): flag dead filters, broken patterns and ignored constraints
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feat(pe): validate submission requirements and group coverage
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fix(pe): do not panic on array values with a string pattern filter
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docs(pe): document filter semantics and validation rules
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refactor(pe): apply validator self-review findings
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