Extends the OS/Docker-data split to a three-volume layout: rootfs + Docker-data
(mp0) + SSD user-data (mp1 @ /mnt/sys_drive, backup=1) = the controller's
system_data_path. Clears the controller's "not a separate drive" warning with
zero controller change (it already auto-discovers <sys_drive>/felhom-data and
warns via system.IsMountPoint; the mp reaches the container via the existing
-v /mnt:/mnt:rslave bind).
- build-golden.sh: --mp1 ...,mp=/mnt/sys_drive,backup=1 (env GOLDEN_SYSDATA_GB=8);
findmnt /mnt/sys_drive separate-mount guard + vzdump aborts if mp0 OR mp1 excluded.
- bringup.go: DefaultSysDataMount=mp1; BringUpSpec.{SysDataGrowGB,SysDataMount};
new "4c" online grow-only block mirroring the "4b" Docker-data grow.
- main.go: -sysdata-grow / -sysdata-mount flags wired into all three call sites.
- Tests: SysDataGrow (asserts ResizeLXC mp1 +42G) + SysDataGrowZeroNoResize.
- RUNBOOK extended to the three-volume layout (32 rootfs + 200 docker + 50 user-data).
Static CT volume, NOT an enrolled drive — never enrolls/ejects/decommissions.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017PsnU2ASocYrvzqE82YDYW
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