chore(meta): update changelog

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

CHANGELOG.md

@@ -6,6 +6,19 @@ Format based on [Keep a Changelog](https://keepachangelog.com/).
 
 ## [Unreleased]
 
+### Added
+- Internal monologue trigger system (#414) — enter_location fires on first tick, time_idle fires after 100 ticks of no movement, 300-tick cooldown, dedup within session, random line selection from content pools via ChaCha20 RNG
+- MonologueEvent in ObserverSnapshot v5 — current_monologue field carries id, text, and display duration across the IPC bridge
+- Client monologue display wiring — protocol v5 decoding, GameState extraction, HUD display pass-through
+
+### Fixed
+- NPC spawn missing Interactable component (#413) — NPCs spawned from content and proof room now have Interactable, enabling E-prompt detection
+- PlayerAction::Interact was a no-op (#415) — changed from unit to struct variant with target_entity_id and verb fields, server logs interaction data
+
+### Changed
+- Protocol version bumped from 4 to 5 (MonologueEvent field, Interact variant change)
+- MessagePack fixtures regenerated for protocol v5
+
 ### Changed
 - UIStrings YAML parser now handles arbitrary nesting depth and inline comments — adapts to copy team's restructured ui-strings.yaml with multi-level sections (relationship_states, health_values)
 - HUD uses new YAML keys: `hud.perception_mode_prefix`, `hud.time_prefix`, `hud.health` (empty prefixes display values directly)