fix(server): address PR #14 review — ordering, docs, version pin

- Fix NpcPlugin system ordering: .before(compute_paths) instead of
  .after(advance_tick) so PathRequests are picked up same frame
- Fix stale doc comment in interpretation.rs: system runs BEFORE
  knowledge events, not after
- Add TODO(v0.2) on RelationshipGraph about information boundary
  limitation for multiplayer
- Document cardinal-only movement as deliberate v0.1 choice
- Add comment on manhattan_distance u32::MAX fallback for cross-z
- Pin pathfinding crate to 4.11

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

server/src/npc/mod.rs

@@ -25,7 +25,7 @@ impl Plugin for NpcPlugin {
             .add_systems(
                 Update,
                 routine::check_phase_transition
-                    .after(crate::simulation::time::advance_tick),
+                    .before(crate::simulation::pathfinding::compute_paths),
             );
 
         tracing::debug!("NpcPlugin initialized");