docs(plan): fold review decisions into dotfile-separation spec

I locked the URL (https://git.cjennings.net/dotfiles.git), the bare
repo path (/var/git/dotfiles.git), and the Phase 1 scope. Added
environment.d/envvars.conf (rofi path stripped) and
systemd/user/emacs.service to the minimal/ tree. Promoted the
DESKTOP_ENV=none VM test from optional to required. Made Phase 2's
clone explicit (sudo -u, not chown-after). Tightened Phase 3's order
so unstow and restow happen without a Hyprland reload between them.
Added a note that the new dotfiles repo can't go on GitHub until the
secrets cleanup ships, plus the post-install update flow in Step 3.3.

Replaced the "Before starting" question block with a Status table
since all five open questions are now resolved.

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