diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6aa32af5f..14e8a9130 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,9 +12,12 @@ Format based on [Keep a Changelog](https://keepachangelog.com/).
 - SQLite settings storage — per-player persistent settings via rusqlite (bundled), IPC protocol v20 with ChangeSettings/RequestAllSettings/DeleteSetting commands (#627)
 - Composable behavior engine — three-layer action+modifier+context primitives replace flat culture×zone×role behavior strings (#633, D-139, Q-057 resolved)
 - Stronger few-shot examples for Friendly and RoutineDeviation tells (#651)
+- AI-Enhanced Dialogue toggle — settings panel toggle with layered hardware detection (RAM/TPT/degradation), battery auto-suspend with player override, warning label (#646, D-138)
+- PlatformInfo autoload — client-side OS abstraction centralizing all platform queries: power state, memory, CPU, GPU, display, locale, file paths, diagnostics helper (#659, D-141)
 
 ### Removed
 - v0.1 content loading system — server/src/content/ module (8200 lines), tooling/content-converter/, tooling/validate-content, content-ron/, content/_meta/ (#655, D-122)
+- AiDialogueDetector — duplicate of HardwareDetector, replaced by PlatformInfo abstraction (#659)
 
 ### Changed
 - Protocol version bumped to 20 — ObserverSnapshot includes settings_response field (#627)