skills: pkgrepo — FreeBSD persistent host key, OpenBSD rc_bg, 2026-07-10 state

- FreeBSD: host key now persistent in /var/db/dserver (cleanvar purged
  the old /var/run location every boot); document the migrate-first
  upgrade order for pre-2026-07-10 packages and that the rc.d precmd
  now repopulates the key cache on every start (manual re-run only
  needed when authorized_keys changed without a restart)
- OpenBSD: rc.d uses rc_bg=YES + plain rc_cmd since 2026-07-10 (the
  old 'rc_cmd $1 &' hid rc_pre failures from rcctl); note that the
  FREEBSD_HOST=f0.wg0 override applies to all dtail-* targets
- NetBSD: drop the outdated "unlike FreeBSD" volatile-key comparison
- Verification table: f0-f2 and fishfinger reverified 2026-07-10 with
  host key identity preserved; f3 unreachable (still on old package),
  blowfish still on the older package

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

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