After nixos-rebuild switch, write /var/lib/clawd/deploy/last-switch.{time,rev}.
clawdinator-version now optionally fetches OpenClaw commit date via GitHub API when gh is authenticated.
Expose pinned component revs via /etc/clawdinator/build-info.json and ship a clawdinator-version helper script (logic lives in scripts/, not inline in Nix).
This supports fleet consistency checks and maintainer introspection.