docs: add CHANGELOG.md with full release history

Author: MiniCodeMonkey

CHANGELOG.md

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+# Changelog
+
+All notable changes to Chief are documented in this file.
+
+## [0.4.0] - 2026-02-06
+
+### Features
+- Add `l` keybinding to open PRD picker in selection mode
+
+### Bug Fixes
+- Prevent Claude from implementing PRD after creation
+- Let Claude write prd.json directly with better error handling
+
+## [0.3.1] - 2026-02-04
+
+### Bug Fixes
+- Fix TUI becoming unresponsive after ralph loop completes
+
+## [0.3.0] - 2026-01-31
+
+### Features
+- Add syntax highlighting for code snippets in log view
+- Add editable branch name in branch warning dialog
+- Add first-time setup flow with gitignore prompt
+
+### Bug Fixes
+- Launch Claude from project root for full codebase context
+
+## [0.2.0] - 2026-01-29
+
+### Features
+- Add max iterations control with `+`/`-` keys
+- Enhanced log viewer with tool call icons and full-width results
+- Add branch protection warning when starting on main/master
+- Add crash recovery with automatic retry
+
+### Bug Fixes
+- Remove duplicate "Converting prd.md to prd.json..." message
+
+## [0.1.0] - 2026-01-28
+
+Initial release.
+
+### Features
+- Core agent loop with Claude Code integration
+- TUI dashboard with Bubble Tea
+- PRD file watching and auto-conversion
+- Parallel PRD execution
+- Log viewer with tool cards
+- PRD picker with tab bar
+- Help overlay
+- Narrow terminal support
+- Completion sound
+- CLI commands: `chief new`, `chief edit`, `chief status`, `chief list`
+- Homebrew formula and install script
+
+[0.4.0]: https://github.com/MiniCodeMonkey/chief/compare/v0.3.1...v0.4.0
+[0.3.1]: https://github.com/MiniCodeMonkey/chief/compare/v0.3.0...v0.3.1
+[0.3.0]: https://github.com/MiniCodeMonkey/chief/compare/v0.2.0...v0.3.0
+[0.2.0]: https://github.com/MiniCodeMonkey/chief/compare/v0.1.0...v0.2.0
+[0.1.0]: https://github.com/MiniCodeMonkey/chief/releases/tag/v0.1.0