Codifies the quality bar already implicit in the CI gates and existing
code patterns (crate-boundary SRP, per-domain db modules, test comment
style) so it's explicit and reviewable rather than tribal knowledge.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PqTJmazHBQK878vjQ4JnnF
