Two bugs:
1. The Dockerfile editor and Image Tag input on the executor profile page
stored their values in component-local useState inside DockerSections,
not in the form state. Saving the profile never wrote them back, so
"Use defaults" / typing in the editor / changing the tag never
persisted — and the Build button was the only thing that consumed
them. The same gap existed in the new-executor flow's
buildProfileConfig.
Lift `dockerfile` and `image_tag` into useProfileFormState (edit) and
useCreateProfileFormState (new), and emit them in buildSaveConfig /
buildProfileConfig so they round-trip through profile.config.
2. Even when an image_tag is set on the profile, the container builder
ignored it. imageName was always derived from the agent runtime's
hardcoded `kandev/multi-agent`, so a user who built a custom image
like `kandev/agent:latest` would still see Docker fail with
"No such image: kandev/multi-agent:latest".
Propagate `profile.config.image_tag` → metadata
(`image_tag_override`) → ExecutorCreateRequest → ContainerConfig,
and let it override `rt.Image` in buildContainerConfig when set.
Also align the frontend default image tag (kandev/multi-agent:latest)
with the backend's hardcoded runtime default so users who don't override
end up with a working build.
José Almeida
f470ea85e2