feat(server): initialize Rust/bevy_ecs simulation server

Server boilerplate epic (276) complete. Establishes the Rust simulation
server foundation per D-020 (subprocess/IPC architecture).

Structure:
- bevy_ecs 0.18 + bevy_app 0.18, MessagePack serialization (rmp-serde)
- SimulationPlugin with deterministic resources: SimulationTime (D-031),
  SimRng (D-030), InputQueue (D-010)
- Core IPC types: ObserverSnapshot, PlayerInput, SimBridge trait (D-020)
- CauseChain production component for provenance tracking (D-030)
- SimulationTier types with LRU eviction support (D-026)
- NPC 10-axis model components (D-024)
- 15 tests: inline unit tests + integration smoke/serialization tests
- make ci-server passes (clippy, fmt, build, test)

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

server/src/npc/mod.rs

@@ -0,0 +1,76 @@
+// NPC module - NPC entity definitions and AI systems
+// Implements D-024: 10-axis NPC model + CombatCapability component
+// Background tier state machines for schedule, mood, relationships, job
+
+use bevy_ecs::prelude::*;
+use serde::{Deserialize, Serialize};
+
+#[derive(Component, Debug)]
+pub struct Npc;
+
+// 7 essential axes (D-024)
+#[derive(Component, Debug, Clone, Serialize, Deserialize)]
+pub struct Want {
+    pub description: String,
+}
+
+#[derive(Component, Debug, Clone, Serialize, Deserialize)]
+pub struct Secret {
+    pub description: String,
+}
+
+#[derive(Component, Debug, Clone, Serialize, Deserialize)]
+pub struct Relationships {
+    pub entries: Vec<Relationship>,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct Relationship {
+    pub target_name: String,
+    pub kind: String,
+    pub trust_level: f32,
+}
+
+#[derive(Component, Debug, Clone, Serialize, Deserialize)]
+pub struct ToleranceThreshold {
+    pub current_stress: f32,
+    pub threshold: f32,
+}
+
+#[derive(Component, Debug, Clone, Serialize, Deserialize)]
+pub struct DailyRoutine {
+    pub description: String,
+}
+
+#[derive(Component, Debug, Clone, Serialize, Deserialize)]
+pub struct InformationInventory {
+    pub known_facts: Vec<String>,
+}
+
+#[derive(Component, Debug, Clone, Serialize, Deserialize)]
+pub struct Contentment {
+    pub level: f32,
+}
+
+// 3 supporting axes (D-024)
+#[derive(Component, Debug, Clone, Serialize, Deserialize)]
+pub struct PersonalityTraits {
+    pub traits: Vec<String>,
+}
+
+#[derive(Component, Debug, Clone, Serialize, Deserialize)]
+pub struct TellSystem {
+    pub tells: Vec<String>,
+}
+
+#[derive(Component, Debug, Clone, Serialize, Deserialize)]
+pub struct SkillSet {
+    pub skills: Vec<String>,
+    pub combat_trained: bool,
+}
+
+#[derive(Component, Debug, Clone, Serialize, Deserialize)]
+pub struct CombatCapability {
+    pub weapon_proficiency: f32,
+    pub combat_style: String,
+}