docs: update CHANGELOG with full Unreleased changes

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: CC11001100

CHANGELOG.md

@@ -7,16 +7,24 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Added
+- README: AI Agent Integration Architecture diagram (ASCII) showing how Skills,
+  MCP Server, CLI, and SDK layer together.
+- README: Chinese architecture diagram with translated labels.
+- README: AI agent compatibility subtitle in header (English + Chinese).
+- Skills: `installation/SKILL.md` now includes Claude Code plugin install as Step 0.
+- Skills: `mcp-operations/SKILL.md` now includes per-client configuration table
+  (Claude Code, Cursor, Windsurf, VS Code Copilot).
+
 ### Changed
 - README: improved AI Agent integration docs — correct Claude Code plugin install commands
   (two-step marketplace add → plugin install), added multi-client MCP configuration
   (Claude Code, Cursor, Windsurf, VS Code Copilot), added Plugin vs MCP comparison,
   added "How it works" explanation for Skills, removed duplicate sections.
 - README: updated Chinese section with matching AI Agent docs improvements.
-- Skills: updated `installation/SKILL.md` to include Claude Code plugin install as Step 0
-  and multi-client MCP configuration.
-- Skills: updated `mcp-operations/SKILL.md` to cover multi-client configuration
-  (Claude Code, Cursor, Windsurf, VS Code Copilot) with per-client config table.
+- Skills: updated `installation/SKILL.md` with multi-client MCP configuration.
+- Skills: updated `mcp-operations/SKILL.md` with multi-client configuration
+  and per-client config table.
 - CONTRIBUTING: updated Go version requirement from 1.23+ to 1.25+.
 
 ## [0.2.0] - 2026-06-19