diff --git a/CHANGELOG.md b/CHANGELOG.md
index 91170718e..578cf79e7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,13 @@ Format based on [Keep a Changelog](https://keepachangelog.com/).
 ## [Unreleased]
 
 ### Added
+- Protocol version handshake — `HandshakeMessage` as first IPC frame before tick loop, forward-compatible input handling (#555, D-020)
+- State serialization primitives — `serialize_npc_to_frozen`/`deserialize_npc_from_frozen` with full D-024 10-axis coverage for tier eviction freeze/thaw (#96, D-026)
+- Scope tag system — `ScopeTagKind` (Neighborhood, ActiveQuest, Colleague, KnownContact), `ScopePinned` marker, automatic assignment from KnowledgeGraph and RelationshipGraph (#98, D-026)
+- Timestamp-based eviction — `LastInteractionTick` LRU tracking, `SimSpacePressure` resource, BinaryHeap eviction respecting scope-pinned entities, Active cap 80 (#97, D-026)
+- Save/load ECS extraction — `save_to_file`/`load_from_file` via MessagePack, `SaveGame`/`LoadGame` IPC commands, `SaveLoadResultWire` on ObserverSnapshot (#553, D-085)
+- Test infrastructure — Layer 3 integration test entry point, three-layer architecture per D-030 (#200)
+- Information boundary negative tests — 4 tests proving no passive KG leakage, LOS fog holds, tier boundary holds, per-NPC save isolation (#272, D-010)
 - Protocol v14 — `poi_list`, `examine_result`, `player_knowledge` ObserverSnapshot wire types with live KG serialization (#151, #174, #264)
 - Minimap rendering — circular 160px diegetic insert overlay with POI dots (colored by category), border arrows for distant POIs, player-centered fixed-north (#151)
 - Dialogue UI hardening — confrontation italic voice (D-063), examine result overlay with 5s auto-dismiss and confidence coloring (#174)