Adds ADR-024 pinning Caddy (xcaddy + caddy-dns/gandi) as boma's reverse
proxy, superseding the soft Traefik assumption in the roadmap and ADR-017
prose. Updates CLAUDE.md Further reading table and ROADMAP.md Phase-2 step 5.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
