fix(simulation): address PR #89 review — version comment, settings contract, docs, dead process recovery

Must-fix: protocol version comment now references PROTOCOL_VERSION
(no hardcoded number), settings delete is idempotent no-op.

Suggestions addressed: BehaviorModifier dedup claim dropped, hash
collision safety documented, FK pragma in test store, columns_to_value
consolidated, modifier_hint mismatch logging, OffDuty test coverage,
batching tradeoff documented, unknown value_type warning, occluded
text risk documented, dead child respawn in voice worker, INJECT
block ambiguity documented.

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

server/src/npc/blueprint.rs

@@ -158,7 +158,6 @@ impl Default for BehaviorContext {
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct BehaviorModifier {
     /// Modifier category for matching against `BehaviorPrimitive.modifier_hint`.
-    /// Also used for dedup — at most one modifier per category per NPC.
     pub category: String,
     /// The modifier clause text. Concatenated to action text with a space.
     pub clause: String,
@@ -197,6 +196,10 @@ pub fn assemble_behaviors(
             let hinted: Vec<&BehaviorModifier> =
                 modifiers.iter().filter(|m| &m.category == hint).collect();
             if hinted.is_empty() {
+                tracing::trace!(
+                    "modifier_hint '{}' matched no category; falling back to all modifiers",
+                    hint
+                );
                 modifiers.iter().collect()
             } else {
                 hinted
@@ -674,6 +677,36 @@ mod tests {
         assert_eq!(all.len(), 3);
     }
 
+    #[test]
+    fn assemble_behaviors_off_duty_context_filter() {
+        use crate::simulation::rng::SimRng;
+        let mut rng = SimRng::new(42);
+
+        let primitives = vec![
+            BehaviorPrimitive {
+                action: "operates crane".into(),
+                context: BehaviorContext::OnShift,
+                modifier_hint: None,
+            },
+            BehaviorPrimitive {
+                action: "sleeps in bunk".into(),
+                context: BehaviorContext::OffDuty,
+                modifier_hint: None,
+            },
+            BehaviorPrimitive {
+                action: "stretches".into(),
+                context: BehaviorContext::Any,
+                modifier_hint: None,
+            },
+        ];
+
+        // OffDuty filter: should return OffDuty + Any, exclude OnShift
+        let off_duty = assemble_behaviors(&primitives, &[], Some(BehaviorContext::OffDuty), &mut rng);
+        assert_eq!(off_duty.len(), 2);
+        assert_eq!(off_duty[0], "sleeps in bunk");
+        assert_eq!(off_duty[1], "stretches");
+    }
+
     #[test]
     fn assemble_behaviors_hint_fallback_to_any_modifier() {
         use crate::simulation::rng::SimRng;