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Root cause of "Loader exited 1" with `wget: can't open '/app/jars/app.jar': Permission denied`. DockerRuntimeOrchestrator creates a fresh named volume per replica and mounts it RW at /app/jars. Docker initializes empty named volumes from the image's mountpoint contents — but /app/jars didn't exist in the loader image, so the volume came up as root:root 0755. Loader runs as UID 1000 and can't write to a root-owned dir. Pre-create /app/jars in the image owned by `loader`. Volume init now inherits loader:loader ownership and wget writes app.jar successfully. Verified locally with the full hardening contract (cap_drop ALL, readonly rootfs, /tmp tmpfs, no-new-privileges, apparmor=docker-default). This is the conditional CI build's first real exercise — the loader-build step gated on cameleer-runtime-loader/** changes will fire on this push and produce the fixed `:latest` tag. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>