chore: update CHANGELOG for v0.3.0 release

[ThomasK33]

Release v0.3.0

This release adds significant terminal improvements, diff UI enhancements, and new configuration options.

Terminal Enhancements

• External terminal provider to run Claude in a separate terminal
• Working directory control for Claude terminal
• Support for function values in external_terminal_cmd
• Added "none" terminal provider option for external CLI management
• Shift+Enter keybinding for newline in terminal input
• focus_after_send option to control focus after sending to Claude

Diff UI Improvements

• Redesigned with horizontal layout and new tab options
• Prevention of diff on dirty buffers
• keep_terminal_focus option for diff views
• Control behavior when rejecting "new file" diffs

New Features

• Added Claude Haiku model support
• CLAUDE_CONFIG_DIR environment variable support
• WebSocket authentication with UUID tokens
• MCP tools compliance aligned with VS Code specs
• Mini.files integration

Bug Fixes

• Fixed logging in fast-event contexts
• Improved native terminal behavior with buffer handling
• Fixed Snacks integration window issues
• Debounced selection updates for stability

Documentation

• Updated protocol documentation with VS Code tool specs
• Improved configuration examples and installation guides
• Added community extensions section
• New AGENTS.md documentation

[ThomasK33]

• chore: update CHANGELOG for v0.3.0 release #131 👈 (View in Graphite)
• main

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