chore(meta): update changelog

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

CHANGELOG.md

@@ -7,8 +7,17 @@ Format based on [Keep a Changelog](https://keepachangelog.com/).
 ## [Unreleased]
 
 ### Changed
+- Simplified vision cone from 3-sector (forward/peripheral/blind) to forward-only 120° arc — server sends only forward-cone tiles, client renders explored tiles behind the player with light fog overlay
+- Simplified fog shader from 5-layer to 3-layer model (clear, explored, unexplored)
+- Fog texture resize now preserves exploration data — tiles behind the player stay as light fog instead of reverting to unexplored black
+- Updated D-015/D-017 perception decisions to reflect simplified cone model
 - Moved connector scripts from db/connectors/ to tooling/db/ (#274) — symlink at old path for backwards compatibility
 
+### Added
+- D-110 through D-112: z-level addressing, subterranean architecture, no instancing decisions
+- Q-051: speech bubble indicator over speaking NPCs
+- Sprint 22 "Wire" briefings (server, client, visual, CI, planning, joint)
+
 ## [v0.1.20] — 2026-02-25
 
 ### Added