podman, postgres, valkey, and nginx are shared services deployed once
per host. Declaring them in meta/main.yml re-ran them on every service
deploy, adding significant time to targeted runs. Playbooks now list
shared services first (tagged 'infra') and every role entry carries a
group tag plus its own name, so '--tags <role>' deploys just that role.
Roles still fail fast when a shared service is missing (password
asserts, postgresql tasks). Prerequisites are documented in role
READMEs. CLAUDE.md updated to reflect the new convention.
Clément Désiles