Each agent ships as its own image, since that's how it runs on the agent
host. nisse-review's image becomes M7.6, ahead of the agent host; its
deployment moves to M7.7. nisse-ops' image comes with its first slice.
Also fixes two stale references to M7.6.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01J5Utyfzw7gF7UhjRDEtjTk