fix(simulation): register interaction systems and persist door state (#246)

Follow-up to b6a9b78: register TerminalInteractedQueue resource and
door/terminal interaction systems in SimulationPlugin; add door state
save/load in save_io (open doors round-trip through SaveStateV1);
make WalkabilityMap param optional in process_door_interaction so
plugin-only tests work without a loaded map; fix information_boundaries
test missing open_doors field.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

server/src/simulation/mod.rs

@@ -62,6 +62,7 @@ impl Plugin for SimulationPlugin {
             // Init here so SimulationPlugin works standalone in tests without those plugins.
             .init_resource::<crate::npc::relationships::RelationshipGraph>()
             .init_resource::<crate::knowledge::KnowledgeEventQueue>()
+            .init_resource::<interaction::TerminalInteractedQueue>()
             .add_systems(
                 Update,
                 (
@@ -92,6 +93,12 @@ impl Plugin for SimulationPlugin {
                     poi_discovery::discover_pois
                         .after(crate::perception::observer::compute_visibility_geometry)
                         .before(crate::perception::observer::compute_observer_snapshot),
+                    interaction::process_door_interaction
+                        .after(input::process_player_input)
+                        .before(movement::validate_movement),
+                    interaction::process_terminal_interaction
+                        .after(input::process_player_input)
+                        .before(crate::perception::observer::compute_observer_snapshot),
                     examine::process_examine_interaction
                         .after(input::process_player_input)
                         .before(crate::perception::observer::compute_observer_snapshot),