HM activation inside `nixos-enter` failed with `big.lock: Permission
denied` because the chroot has no systemd and therefore no nix-daemon —
the user-level `nix run` fell back to single-user mode and couldn't
write /nix/var/nix/db. Launch nix-daemon manually for the activation
window and force NIX_REMOTE=daemon. Also mark /etc/nixos (and the
impermanence path) as a git safe.directory so HM doesn't trip over
git's dubious-ownership check on the root-owned repo. Make
nomarchy-env-update self-bootstrap via `nix run home-manager` when
home-manager isn't on PATH so the recovery hint actually works on a
freshly-installed system.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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