[fank]

Summary

• Make the published-image root Compose example the documented installation path; distinguish source-build checksums and show pull/recreate upgrades.
• Document PUID/PGID and rootless ownership, safer RCON exposure, first-start settings and mod-updater credentials.
• Replace raw envsubst JSON interpolation with an executable jq provisioning example that preserves unset fields and safely encodes supplied strings.
• Document the reported Podman slirp4netns workaround with upstream limitations.
• Deprecate scenario2map in the guide, retaining the script and explaining the supported scenario/start/save alternative.

Closes #552.
Closes #541.
Closes #560.
Closes #456.
Closes #352.
Closes #197.
Closes #439.
Closes #378.

Validation

• Documentation-parsing Python tests were removed following maintainer feedback.
• docker compose config validated both repository Compose files and the complete README provisioning example.
• The documented jq command was validated locally with: quotes, backslashes, newlines, Unicode, unset and empty variables, and malformed templates preserving existing settings.
• Podman networking limitations checked against its official documentation; no claim of reproducing a user-specific NAT setup.