Hugh KaznowskiandClaude Sonnet 5
c3108677ce
Formats the whole backend to rustfmt defaults and fixes all 23 outstanding clippy warnings (collapsible ifs, clone-to-slice-ref, type-complexity, single-arm match, unnecessary is_none check), then wires cargo fmt --check and -D warnings into make lint so both stay enforced going forward. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01TeyhRfMYjMditek6geDRoQ