feat(ci): add tracing::instrument to heavy per-tick systems, fix stale protocol comment (#344, #527)

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

server/src/perception/observer/mod.rs

@@ -29,6 +29,7 @@ use crate::simulation::time::SimulationTime;
 /// Stage 1 of the observer pipeline: FOV + vision cone → VisibilityGeometry.
 ///
 /// System ordering: after validate_movement, before compute_observer_snapshot.
+#[tracing::instrument(level = "debug", skip_all)]
 pub fn compute_visibility_geometry(
     walkability: Res<WalkabilityMap>,
     mode: Res<ActivePerceptionMode>,
@@ -52,6 +53,7 @@ pub fn compute_visibility_geometry(
 ///
 /// System ordering: after compute_visibility_geometry + compute_nearby_interactions,
 /// before advance_tick.
+#[tracing::instrument(level = "debug", skip_all)]
 #[allow(clippy::type_complexity, clippy::too_many_arguments)]
 pub fn compute_observer_snapshot(
     time: Res<SimulationTime>,