feat(simulation): sprint 10 — hub teleport, confrontation response, walk-away phase 2, gauntlet rooms 4-7, blocked_entities debug field

#491: PlayerAction::TeleportToHub — moves player to hub spawn, clears
dialogue/monologue/interaction buffer, Gauntlet-only with log warning.
#520: ConfrontationDelivered event — Tier 2 animation shift, relationship
state decrement (D-033), monologue spike emission.
#519: Walk-away Phase 2 — NPC animation shift + routine deviation on
dialogue exit (D-064).
#498: Four new Gauntlet rooms — Interaction Gallery, Fog Theater, Crowd
Plaza, Dialogue Room with constants and wiring.
#514: blocked_entities Vec<u64> on ObserverSnapshot, protocol v9.

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

server/src/knowledge/types.rs

@@ -129,6 +129,23 @@ pub enum RelationshipState {
     Hostile,
 }
 
+impl RelationshipState {
+    /// Decrement relationship state toward more negative (D-063 confrontation response).
+    ///
+    /// Friendly → Known → PersonOfInterest → Hostile.
+    /// Unknown stays Unknown (can't confront a stranger meaningfully).
+    /// Hostile stays Hostile (already worst state).
+    pub fn decrement(self) -> Self {
+        match self {
+            Self::Friendly => Self::Known,
+            Self::Known => Self::PersonOfInterest,
+            Self::PersonOfInterest => Self::Hostile,
+            Self::Unknown => Self::Unknown,
+            Self::Hostile => Self::Hostile,
+        }
+    }
+}
+
 // --- Entity Knowledge ---
 
 /// What entity A knows about entity B.