Record review of prevalence-filtering

[lwaldron]

Adds the review block and frontmatter entry for the review given on #44 before it was merged.

Drafted with Claude Code.

[claude]

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[Copilot]

🟢 Approval recommended

The review entries are consistent, and the documentation-only changes have no unresolved findings.

No open issues 🎉

What changed in this PR

Records the review of the prevalence-filtering protocol completed before #44 was merged.

Changes:

• Adds structured reviewer metadata and approval status.
• Replaces “No reviews yet” with a matching review summary and notes.

File	Description
protocols/​prevalence-filtering/​protocol.md	Adds review metadata and a human-readable review record.

_{Review effort: Balanced}