docs: sanitize local operations paths

[Bortlesboat]

Summary

• Replace public operations-guide references to a user-specific local ops path with <ops-root> placeholders.
• Keeps the public runbook useful without exposing personal machine layout details.

Verification

• git diff --check HEAD~1..HEAD
• git grep -n -F 'C:/Users/andre' -- docs/OPERATIONS.md returned no matches.