fix(simulation): PR #66 review — dedup vision, spawn components, doc fixes

- vision.rs: deduplicate own-tile entity iteration, add same-tile test
- spawn.rs: add NpcVisionState, NpcMemory, PlayerAwareness to content-
  spawned NPCs (matching generate_npc)
- pressure.rs: update who_knows_full_scan doc to reflect actual call
  frequency, document O(N) acceptability at call site
- types.rs: fix stale protocol version comment (13→14)
- generate.rs: format!() → .to_string() (clippy)
- vision.rs: hardcoded 10 → TICKS_PER_GAME_MINUTE
- relationships.rs: fix comment "15%" → "20%" to match code
- pressure.rs: document total() floor-truncation
- save_state.rs: document NpcMemory exclusion as intentional

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

server/src/simulation/pressure.rs

@@ -82,9 +82,12 @@ pub struct CharacterPressure {
 }
 
 impl CharacterPressure {
-    /// Total pressure as a weighted average of all axes (0–100).
+    /// Total pressure as a simple average of all axes (0–100).
+    ///
+    /// Uses integer division — remainders are floor-truncated (D-010, no floats).
+    /// Maximum rounding error is 2 units (e.g. axis sum 101 → 33 instead of 33.67).
     pub fn total(&self) -> i32 {
-        // Simple average, clamped. Integer arithmetic only (D-010).
+        // Simple average, clamped. Integer division truncates toward zero (D-010).
         ((self.exposure + self.institutional + self.relationship) / 3).clamp(0, 100)
     }
 
@@ -178,6 +181,8 @@ pub fn update_character_pressure(
     // --- Relationship pressure ---
     let player_stable = registry.to_stable(player_entity);
     if let Some(player_sid) = player_stable {
+        // O(N) over all relationship edges — called once per game-minute, not every tick.
+        // Acceptable at v0.1 NPC counts (<100 NPCs = <100 edge iterations).
         let hostile_edges = relationship_graph
             .who_knows_full_scan(&player_sid)
             .iter()