feat(simulation): dialogue pipeline, ContentSlug, and walk-away KG recording

Implement full dialogue selection pipeline (D-028): 4-layer filtering
engine with access tier, situation derivation, trust tier, and weighted
topic+mood scoring via SimRng. Add ContentSlug component for stable
content identity across save/load. Add walk-away KG recording with
IncompleteInteraction events per D-064 three-phase consequences. Bump
protocol to v8 with DialogueResponseEvent. Fixes #305, #427, #452.

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

server/src/bridge/mod.rs

@@ -167,12 +167,19 @@ impl Plugin for BridgePlugin {
                         .after(crate::simulation::movement::validate_movement),
                     crate::simulation::monologue::trigger_monologue
                         .after(crate::simulation::movement::validate_movement),
-                    crate::simulation::monologue::process_sprint_anomaly_monologue
+                    crate::simulation::monologue::trigger_recognition_monologue
                         .after(crate::simulation::monologue::trigger_monologue),
+                    crate::simulation::monologue::process_sprint_anomaly_monologue
+                        .after(crate::simulation::monologue::trigger_recognition_monologue),
+                    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),
                     crate::perception::observer::compute_observer_snapshot
                         .after(crate::perception::observer::compute_visibility_geometry)
                         .after(crate::simulation::interaction::compute_nearby_interactions)
                         .after(crate::simulation::monologue::process_sprint_anomaly_monologue)
+                        .after(crate::simulation::dialogue::process_talk_interaction)
                         .before(crate::simulation::time::advance_tick),
                     crate::perception::observation::emit_observation_events
                         .after(crate::perception::observer::compute_observer_snapshot),

server/src/bridge/types.rs

@@ -15,7 +15,7 @@ pub use crate::simulation::time::{DayPhase, TickRate};
 /// negotiation is unnecessary. Client should reject snapshots with version !=
 /// PROTOCOL_VERSION. New fields use #[serde(default)] only during the migration
 /// period, then the default is removed once both sides are updated.
-pub const PROTOCOL_VERSION: u8 = 7;
+pub const PROTOCOL_VERSION: u8 = 8;
 
 /// The ONLY data structure crossing the client-server boundary (D-020)
 /// Contains all information visible to the observer at a given tick.
@@ -26,6 +26,7 @@ pub const PROTOCOL_VERSION: u8 = 7;
 /// v5 adds: current_monologue (#414 internal monologue pipeline).
 /// v6 adds: player_stance (#449, D-053), player_inventory (#449, D-065).
 /// v7 adds: pending_recognitions (#423, D-060 cognitive delay).
+/// v8 adds: dialogue_response (#305, D-028 dialogue pipeline).
 /// Future fields: ambient sound events, HUD state (D-020 expansion).
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct ObserverSnapshot {
@@ -62,6 +63,11 @@ pub struct ObserverSnapshot {
     /// Empty when no recognitions are pending.
     #[serde(default)]
     pub pending_recognitions: Vec<PendingRecognitionWire>,
+    /// Dialogue response from Talk verb interaction (#305, D-028).
+    /// Present when the player talked to an NPC this tick and a line was selected.
+    /// Client shows speaker name + dialogue text in a dialogue box.
+    #[serde(default)]
+    pub dialogue_response: Option<DialogueResponseEvent>,
 }
 
 /// Game time data for client display (D-031)
@@ -300,6 +306,10 @@ pub enum PlayerAction {
     UsePerceptionMode(String),
     Pause,
     Unpause,
+    /// Player walked away during active dialogue (WASD during conversation, D-064).
+    /// Client sends this when movement input is detected while dialogue box is visible.
+    /// Server records incomplete interaction in KG and clears dialogue state.
+    WalkAway,
     /// Set tick rate: Full (1.0), Half (0.5), or Paused (0.0) per D-052
     SetTickRate(TickRate),
     /// Move one step up the stance ladder (toward Sprint) per D-053
@@ -434,6 +444,18 @@ pub struct MonologueEvent {
     pub duration_seconds: f32,
 }
 
+/// Dialogue response event sent to the client for display (#305, D-028).
+/// Contains the selected line and speaker identity. Client renders a dialogue box.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct DialogueResponseEvent {
+    /// Dialogue line ID (for dedup and cooldown tracking)
+    pub line_id: String,
+    /// The dialogue text to display
+    pub text: String,
+    /// Wire-format entity identifier of the speaking NPC
+    pub speaker_entity_id: u64,
+}
+
 /// Snapshot buffer resource for staging outgoing ObserverSnapshots
 #[derive(Resource, Debug, Default)]
 pub struct SnapshotBuffer {