docs(changelog): update for v2.3.0

CHANGELOG.md

@@ -1,5 +1,24 @@
 # Changelog
 
+## v2.3.0 — 2026-07-24
+
+### Features
+
+- open merge-helper ConPTY tile from selection (083e1f3)
+- add "Let Claude handle it" entry points (ecbc734)
+- add merge-helper task selection dialog (327ae2b)
+- expose merge-helper launch spec over hub + client (5ba0c09)
+- build merge-helper interactive launch spec (78d4e1a)
+- add merge-helper prompt templates (c7d64e9)
+- add continue_merge and abort_merge MCP tools (7517f2a)
+- let review_task/merge_task leave conflicts in tree via MCP (f4f7c81)
+
+### Documentation
+
+- helper handles all merges; manual conflict fallback (2a3ab55)
+- spec + implementation plan (962f68c)
+- update for v2.2.0 (d12a888)
+
 ## v2.2.0 — 2026-07-24
 
 ### Features