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/workspace - the DSH image's WORKDIR, where agents keep files - was plain container storage, so every suspend/resume or pod replacement silently threw agent work away while DSH state survived on the PVC. Mount the same per-sandbox `dsh-home` PVC a second time at /workspace with `subPath: workspace`. One PVC, no extra provisioning, and the subPath keeps DSH state (sessions, config and .credentials.yaml at the volume root) out of the agent-visible tree; mounting the volume root at /workspace would have exposed the credential file. The kubelet creates the missing subPath directory itself and chmods it to the volume's fsGroup permissions, and the volume root's setgid bit makes the new directory inherit gid 1000, so UID 1000 can write with no init container and no root. The rare interrupted-kubelet case that leaves 0755 is documented with a recovery procedure (kubernetes#142464) rather than papered over. - e2e-kind: write a /workspace marker alongside the DSH_HOME marker, assert the mount is the dsh-home subPath, and verify both survive suspend/resume. - Docs: README (overview, steps 4-6, troubleshooting row), architecture (PVC diagram, persistence, component table), main-image working-directory row, platform runbook PVC row. Verified: make check (14 manifests), make lint, plus YAML assertions on the two mounts and the unchanged volumeClaimTemplates. Co-authored-by: SREDevOpsAgents <agents@sredevops.org>