[StuartFerguson]

Summary

• Add client-registration regression coverage for legacy grant allowlisting.
• Assert legacy password clients receive only the permissions they requested.
• Verify Data Protection keys can be reused across provider instances.

Related to #1730.

Verification

• Unit test executable: 160/160 applicable tests passed.
• Full unit run: 162 total, with 2 existing certificate-loader failures caused by sandbox PFX private-key restrictions.

[chatgpt-codex-connector]

Codex Review Summary

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-10-07T18:01:16.486991Z	25ab34c	PR opened

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[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

Results:
0 new issues

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🟢 Metrics 0 complexity · 0 duplication

Metric	Results
Complexity	0
Duplication	0

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[chatgpt-codex-connector]

💡 Codex Review

Here are some automated review suggestions for this pull request.

Reviewed commit: 25ab34c77d

ℹ️ About Codex in GitHub

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• Open a pull request for review
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• Comment "@codex review".

If Codex has suggestions, it will comment; otherwise it will react with 👍.

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