raft-apply-decoupling: 32/32 tasks complete, validate-impl GO (79/79 test
groups, live smoke boot verified) -- update roadmap's In Flight entry with
outcome, residuals, and follow-ups.
raft-drive-async: all 17 sub-tasks were already [x] but the 4 phase-header
checkboxes were never ticked, leaving tasks.md looking incomplete. Confirmed
via source (g_drive_async_configpush_offload defaults to 1) and prior
session notes that all 4 phases genuinely landed and flipped ON in
production; checkboxes now match reality.