feat(edaas): add daily headless Renovate PR review timer

Add a systemd user timer on the EDaaS/WSL host that runs Claude Code
headless once a day (08:47) to review Renovate dependency PRs awaiting
Emma's review. It queries GitHub via the project-scoped github MCP
server, excludes PRs against archived repositories, grades each PR's
risk, and writes a recommendation-only summary to the journal
(journalctl --user -u renovate-review). It never approves or merges.

- lyrathorpe/home/renovate-review.nix: wrapper + service + timer.
  Auth is Vertex AI via the inherited project/region/model env; Claude
  Code provisions its own network egress, so no proxy is set. The
  prompt lives in a store file so its literal backticks/$ don't trip
  shellcheck in the wrapper.
- lyrathorpe/home/work.nix: import the module (host-scoped to EDaaS).
- system/machine/EDaaS/configuration.nix: enable user linger so the
  timer fires without an attached login session.

system/machine/EDaaS/configuration.nix

@@ -58,6 +58,13 @@
   systemd.services.docker-desktop-proxy.script = lib.mkForce ''${config.wsl.wslConf.automount.root}/wsl/docker-desktop/docker-desktop-user-distro proxy --docker-desktop-root ${config.wsl.wslConf.automount.root}/wsl/docker-desktop "C:\Program Files\Docker\Docker\resources"'';
 
   features.swayDesktop.enable = false;
+
+  # Keep this user's systemd --user instance running without an open login
+  # session, so the home-manager user timer (renovate-review.nix) fires on
+  # schedule even when no terminal is attached. On WSL the timer still only runs
+  # while the distro itself is up; Persistent=true catches up a missed run at
+  # next start.
+  users.users.emmathorpe.linger = true;
   # programs.nix-ld is enabled for all NixOS hosts in common-nixos.nix.
   # This value determines the NixOS release from which the default
   # settings for stateful data, like file locations and database versions