fix(agent): stop docker image-pull output from leaking into version log

[skevetter]

detectVolumeVersion used CombinedOutput() to run its docker run ... --version probe, which merges the container's stdout with docker's own stderr diagnostics. When the helper image wasn't cached, that stderr carried a full multi-line image-pull transcript, which then got treated as the detected "version" string and interpolated into a single log.Infof call — producing a garbled, multi-line log entry:

upgraded remote agent from Unable to find image 'busybox:latest' locally
latest: Pulling from library/busybox
b05093807bb0: Pulling fs layer
...
Status: Downloaded newer image for busybox:latest to v0.0.0

Output() only captures stdout, so the detected version is just whatever the container's script actually printed.

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Reviewing files that changed from the base of the PR and between bc98129 and 62ddfe0.

📒 Files selected for processing (2)

• pkg/agent/delivery/local_docker.go
• pkg/agent/delivery/local_docker_test.go

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