swarmexec v1.1.3 — canonical URLs moved to the cs-public namespace

The repository moved from gitlab.logle.io/internal-tools/swarm-remote-exec
to .../cs-public/swarm-remote-exec, and the container registry path moved
with it. This release repoints the canonical references.

- init: `swarmexec init` now deploys the agent from
  registry.logle.io/cs-public/swarm-remote-exec/agent by default.
- deploy manifests, NOTICE, README, site and Docker Hub description now
  point at the cs-public namespace.

No API or wire-protocol change; a v1.1.x agent stays compatible. GitLab
still redirects the old paths, so an existing deployment keeps working
until it is next re-deployed.