feat(simulation): sprint 16 dialogue server — response handler, trust gossip, variety tracker

Move dialogue system registrations from BridgePlugin to NpcPlugin (#538):
game logic that depends on NPC-layer resources now registers where it
belongs. BridgePlugin retains only wire protocol concerns.

Implement DialogueResponse verb handler (#539): new process_dialogue_response
system runs the full D-028 four-layer pipeline to select follow-up lines
when the player picks a dialogue option. Clears ActiveDialogue when no
candidates remain. Fix latent schedule ambiguity — emit_observation_events
now has explicit .before(advance_tick) constraint.

Verify trust-gated gossip pipeline (#171): confirmed process_talk_interaction
correctly passes KnowledgeConfidence through relationship_to_trust() per
D-075. Added integration tests for Secret-tier access (Friendly+KnowsDetails)
and Surface-only fallback (Friendly+Suspects).

Wire DialogueCooldownTracker into selection (#338): added regression test
confirming no line_id repeats within the 600-tick cooldown window across
10 consecutive Talk interactions.

Closes #538, #539, #171, #338

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

server/src/npc/mod.rs

@@ -27,6 +27,7 @@ impl Plugin for NpcPlugin {
     fn build(&self, app: &mut App) {
         app.init_resource::<relationships::RelationshipGraph>()
             .init_resource::<relationships::TrustEventQueue>()
+            .init_resource::<crate::knowledge::KnowledgeEventQueue>()
             .init_resource::<routine::PreviousDayPhase>()
             .init_resource::<tolerance::ToleranceBreachEventQueue>()
             .init_resource::<routine::RoutineDeviationEventQueue>()
@@ -42,6 +43,7 @@ impl Plugin for NpcPlugin {
                         .after(crate::simulation::dialogue::process_talk_interaction)
                         .after(crate::simulation::dialogue::process_walk_away)
                         .after(crate::simulation::dialogue::process_confrontation_response)
+                        .after(crate::simulation::dialogue::process_dialogue_response)
                         .before(crate::simulation::time::advance_tick),
                     relationships::update_relationship_dynamics
                         .after(relationships::update_trust)
@@ -59,6 +61,16 @@ impl Plugin for NpcPlugin {
                         .after(mood::update_mood)
                         .after(routine::detect_routine_deviation)
                         .before(crate::perception::observer::compute_observer_snapshot),
+                    crate::simulation::dialogue::process_talk_interaction
+                        .after(crate::simulation::input::process_player_input),
+                    crate::simulation::dialogue::process_walk_away
+                        .after(crate::simulation::input::process_player_input)
+                        .after(crate::simulation::dialogue::process_talk_interaction),
+                    crate::simulation::dialogue::process_confrontation_response
+                        .after(crate::simulation::input::process_player_input),
+                    crate::simulation::dialogue::process_dialogue_response
+                        .after(crate::simulation::input::process_player_input)
+                        .after(crate::simulation::dialogue::process_talk_interaction),
                 ),
             );