docs: remove apcore-toolkit dependency bump entry from CHANGELOG.

Author: tercel

CHANGELOG.md

@@ -19,10 +19,6 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - **`_build_extensions()` dead code** — `AgentSkill` has no `extensions` field in the A2A SDK; this method could never be wired in. Deleted along with its 3 tests.
 
-### Changed
-
-- Dependency bump: requires `apcore-toolkit >= 0.4.0` for `DisplayResolver`.
-
 ### Tests
 
 - `TestSkillMapperDisplayOverlay` (6 tests): A2A alias used as skill id, A2A description used, tags from display overlay, surface-specific override wins, fallback to scanner values when no overlay.