chore(meta): update changelog

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

CHANGELOG.md

@@ -6,6 +6,18 @@ Format based on [Keep a Changelog](https://keepachangelog.com/).
 
 ## [Unreleased]
 
+### Added
+- Audio discussion decisions D-067 through D-074: recognition chime timing, 5-bus architecture, audio dip profiles, confrontation as cognitive vulnerability, monologue chime placeholder strategy, universal conversation murmur, zone crossfade, hybrid audio generation
+- Asset pipeline documentation system (docs/assets/) with category-based index, sonic palette, and generation templates for audio, visual, and video pipelines
+- Stable Audio Open connector and post-processing wrappers (audio-generate, audio-health, audio-post) with timeout handling for 11GB VRAM constraint
+- gen-audio skill with prompt assembly system (sonic palette prefixes + category templates + asset descriptions)
+- 6 interaction UI audio assets (#440): cursor_hover, weapon_aim, implant_open, fog_recognition, sfx_monologue_chime, sfx_monologue_chime_urgent — generated via SAO, needs duration trimming (#453)
+- Dialogue/confrontation ambient dip implementation spec with full Godot AudioBus tween code
+- Synthesis tooling (tooling/synth_ui_sounds.py) for programmatic insert-tech sound generation
+
+### Changed
+- Renamed asset-gen skill to gen-image for consistent gen-* naming pattern
+
 ### Added
 - Client protocol v6 bridge — decode player_stance (4 variants) and player_inventory from ObserverSnapshot, TOGGLE_STANCE_UP/DOWN input actions, 25 gdUnit4 tests
 - Three-scope z-layer rendering pipeline (D-049) — world z:0-900 inside CanvasGroup, insert overlay CanvasLayer 10, UI CanvasLayer 20, modal CanvasLayer 30. Y-sort contract enforced, reserved VFX/airborne/lower-floor ranges documented