docs(agent): defer #20 KVM CI to FUTURE; keep eval-only VPS

Standing decision: IONOS Gitea/act_runner docker stays eval-tier.
vm-checks needs a separate KVM host later — not the 4G compose box.

agent/BACKLOG.md

@@ -24,17 +24,11 @@ in [`docs/ROADMAP.md`](../docs/ROADMAP.md); map in
 
 ## NOW
 
-*(empty — NEXT's top item is the queue head)*
+*(empty — NEXT is empty; see LATER / FUTURE / PROPOSED)*
 
 ## NEXT
 
-### 20. KVM runner → VM suite in CI `[human]`
-The remaining stretch of the CI item — checks-on-push is live and
-**green** (run #58; runner = gitea/act_runner docker, eval tier).
-Register a second runner on a host with `/dev/kvm` + nix (host-mode
-label `nix-kvm`), then an agent uncomments the workflow's `vm-checks`
-job: the `checks.*` VM suite + real toplevel/HM builds on every push
-that later upgrades the bump gate from eval-only to the full suite.
+*(empty — no actionable queue head; #20 deferred to FUTURE)*
 
 ## LATER