Handoff artifact for next session. v7 is the converged staged plan
(Stage A hardened Ubuntu → B DR primitives → C 6-week soak →
D-optional Talos). User decision pending: pick v4 (full Talos, 117-178h)
vs v7 (staged, 30-37h to decision point) vs hybrid.
Full context in ~/.claude/plans/distributed-humming-sonnet.md.
