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/npc/relationships.rs

@@ -141,7 +141,8 @@ impl RelationshipGraph {
     }
 
     /// Get all entities who have feelings about a target.
-    /// O(N) full scan of all edges — use for event detection, not per-tick queries.
+    /// O(N) full scan of all edges. Called once per game-minute (every 10 ticks)
+    /// by the pressure system — acceptable at v0.1 NPC counts.
     pub fn who_knows_full_scan(&self, target: &StableId) -> Vec<(&StableId, &RelationshipEdge)> {
         self.edges
             .iter()
@@ -292,8 +293,7 @@ impl DelayedTrustQueue {
 /// (D-010: integer-only determinism). Returns 0 when the scaled value would
 /// round to zero — small deltas naturally attenuate to nothing.
 ///
-/// Factor is expressed in tenths (e.g. 4 = 40%, 2 = 15%... using 2/10=20%
-/// as closest deterministic integer approximation of 15%).
+/// Factor is expressed in tenths (e.g. 4 = 40%, 2 = 20%).
 ///
 /// Rounding: away from zero (ceiling of abs value, preserving sign).
 fn scale_delta(delta: i8, factor_tenths: i8) -> i8 {