blk_chain_default, blk_chain_new and blk_chain_select (0e761cb1) were for
a node's own drive, which was withdrawn on 2026-10-07 (docs/v4.0.0/MESH.md
8.5). They are taken out. What remains of that change is that
blk_subsys_init takes no VM.
Accepted on the v3 configuration: amd64, aarch64 and riscv64 reach the
zuse prompt, no UNKNOWN WORD, PARITY:M7.1a hash 0x08873e0f44b7cb2a on all
three, as before. logs/20261007-082647, -082752, -082938.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
