docs(policy): typo fixes in biometric + retention policies

[POWERFULMOVES]

Summary

Rescues two single-character typo fixes stranded in D:/PMOVES.AI/PMOVES.AI-pr1391 (PR #1391 merged 2026-04-26). Both are markdown/SQL accuracy corrections.

Files

• docs/biometric-data-handling-policy.md:249 — Shell pipe escape: mount grep (broken) → mount \| grep in the T4 sandbox monitoring table example. Without the escape, markdown renders the table cell with a stray grep floating outside the code fence.
• docs/data-retention-deletion-policy.md:175 — SQL operator fix: > → < in the retention check query. The original query asked for sessions updated_at > 24h ago (the recent sessions, opposite of intent). The corrected query is updated_at < 24h ago, paired with the clarification that the result should be 0 — meaning sessions older than the retention window must already be purged.

Origin

PR #1391 merged 2026-04-26. Both fixes were drafted in the review worktree but never committed.

Test plan

• Markdown renders the T4 sandbox table cleanly
• SQL query is logically correct (sessions older than policy window → expect 0)

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📥 Commits

Reviewing files that changed from the base of the PR and between 6cf00bb and 62061f3.

📒 Files selected for processing (2)

• docs/biometric-data-handling-policy.md
• docs/data-retention-deletion-policy.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/policy-typo-fixes

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