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krishicks
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Since #2726 the canonical main process's stdout and stderr are captured in pipes that feed only the in-memory replay buffer used by sandbox connect. Agent output therefore never reaches the container's own stdout and stderr, so it is missing from kubectl logs, docker logs, and podman logs and from anything that collects container logs. Before #2726 the entrypoint inherited the container's descriptors and its output appeared there. Copy the main process's output to the launcher's stdout and stderr in addition to the replay buffer, restoring the earlier behavior: - Output is copied byte for byte to the matching stream from a forwarder thread per stream, after it is published to the replay buffer. When the container runtime falls behind on a stream, that stream's reader waits instead of dropping output, so backpressure reaches the agent as it did with inherited descriptors, while the other stream and attachments keep receiving output. - Before the main process's exit is published, the output readers finish and queued output is drained to the container log, so an agent's final lines are not lost at shutdown. A 30 second deadline covers both; when it expires, readers waiting on the container log are released and drain the pipes into the replay buffer only, so a stalled container log cannot block exit reporting. - PTY-mode processes are not copied. The terminal stream carries escape sequences and echoed input, and terminal commands never reached the container log before #2726. - Exec, SSH, and SFTP sessions are not copied. Launcher log lines keep their existing format and remain in the container's stderr. They are written as whole lines, and a newline is inserted first when the agent left stderr mid-line, so launcher and agent lines do not merge. The Docker and VM drivers appended the tail of the workload's output to failure messages: Docker the workload container's log, and the VM driver the guest console, which carries the launcher's stdout and stderr. Those messages land in the sandbox's Ready condition and in platform events that the gateway republishes to the sandbox event stream. With agent output in that log, those messages would carry arbitrary agent output, including anything sensitive the agent prints, into gateway status and events. The supervisor starts its health endpoint only after the agent starts, so every Docker failure path could include agent output, and the VM driver reports one whenever the VM or host supervisor exits. Forward only the supervisor's log tail, matching the Podman driver, which reads the workload log solely to match fixed launcher markers and never forwards raw workload output. The workload's output remains available through docker logs and the VM's rootfs-console.log. Document where main process output appears in the logging docs and the cluster debugging skill. Closes #3928 Signed-off-by: Kris Hicks <khicks@nvidia.com>