fix(actualbudget): preserve migrated data path

AGENTS.md

@@ -18,6 +18,8 @@ The domain model (Host, Module, Skeleton, Auto-loader, Enable convention, overla
 
 ## Gotchas
 
+- Actual Budget's NixOS service runs `actual-server` with `WorkingDirectory = services.actual.settings.dataDir`, and `actual-server` prefers a `config.json` in that current directory over `ACTUAL_CONFIG_PATH`.
+  When migrating old community-script state, either preserve the old in-guest data path or remove/update the copied `config.json`, otherwise stale absolute paths such as `/opt/actualbudget-data/server-files` override the declarative module settings.
 - Subagent completion delivery is non-blocking through immediate spawn, milestone notifications, retained terminal entries, and `subagent_list` or `subagent_result` retrieval.
   `subagent_wait` intentionally blocks the parent tool call until its condition or timeout, so do not use it merely to keep background work alive during an interactive workflow.
 - Nixvim's flake input following the root nixpkgs source does not make its Home Manager module reuse the host's `pkgs` instance.

guests/actualbudget.nix

@@ -16,7 +16,7 @@ my.guest {
       group = "storage";
       settings = {
         port = 5006;
-        dataDir = "/var/lib/actual";
+        dataDir = "/opt/actualbudget-data";
       };
     };
   };

hosts/pikachu/default.nix

@@ -76,7 +76,7 @@
     autoStart = false;
     vlan = 20;
     mac = "BC:24:11:C1:CD:28";
-    mounts."/var/lib/actual".hostPath = "/pikachu/data/actualbudget";
+    mounts."/opt/actualbudget-data".hostPath = "/pikachu/data/actualbudget";
     limits = {
       memory = "2G";
       cpu = "200%";