1. For docker command, look up the repo owner via 'repo search' API
2. Use 'ego-mgr lookup' to get the owner's agent-id
3. Export AGENT_ID to that agent-id so docker push goes to correct namespace
4. Also fix link API auth: use '-u owner:token' (basic auth) instead of
'Authorization: token' header, since repo owner's 'git' secret is a
password not a bearer token
The link step now:
1. Extracts the actual repo owner from the git remote URL
2. Captures HTTP response status and body
3. Shows a clear warning when the repo belongs to a different owner
(requires site admin or matching owner), instead of silently failing
