docs: add CHANGELOG.md + repo grooming

CHANGELOG.md

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+# Changelog
+
+All notable changes to cora-cli are documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+## [0.1.2] - 2025-05-29
+
+### Added
+
+- `cora init` — create `.cora.yaml` config file with provider/model selection
+- `cora hook install|uninstall` — pre-commit hook management
+- `cora config show|set` — configuration management
+- CI composite action (`cora-review-simple`) for easy GitHub Actions integration
+- Shell completions for bash, zsh, fish, and powershell
+- `cora scan --incremental` with SHA256 content hash cache for fast incremental scanning
+- `cora review --upload` for direct SARIF upload to GitHub Code Scanning
+- `cora review --stream` for real-time review output
+- `cora review --unpushed` for reviewing unpushed commits
+- `cora review --base <branch>` for branch comparison
+- `cora review --diff-file <path>` for reviewing external diff files
+- `cora providers` command to list available LLM providers
+- `cora auth login` for interactive API key storage
+
+### Fixed
+
+- SARIF schema compliance for GitHub Code Scanning upload
+- Clippy `format_in_format_args` warnings
+- Replaced deprecated `serde_yaml` with `serde_yaml_ng`
+- Normalized release binary naming (`cora-{arch}-{target}-v{version}.tar.gz`)
+
+### Changed
+
+- Replaced deprecated dependencies
+- Removed unused dependencies
+- Bumped minimum Rust version to 1.85
+
+## [0.1.1] - 2025-05-27
+
+### Changed
+
+- Replaced ASCII art banner with eye icon in README
+- Updated README branding to cora-cli
+
+### Fixed
+
+- CI `cargo publish` with `--allow-dirty` for Cargo.lock mismatch on tag checkout
+
+## [0.1.0] - 2025-05-25
+
+### Added
+
+- **AI Code Review** — review staged changes, commit ranges, branch diffs, and full project scans
+- **BYOK** — bring your own API key (OpenAI, Anthropic, Groq, Ollama, Google)
+- **5 LLM Providers** — with auto-detection from installed API keys
+- **Pre-commit Hooks** — `cora hook install` for automatic review on every commit
+- **SARIF Output** — `--format sarif` for GitHub Code Scanning integration
+- **4 Output Formats** — pretty (colored), compact, JSON, SARIF
+- **Project Config** — `.cora.yaml` per-project configuration with provider, focus, rules, ignore, and hook settings
+- **Environment Variables** — `CORA_API_KEY`, `CORA_MODEL`, `CORA_PROVIDER`, `CORA_BASE_URL`, `CORA_CONFIG`, `CORA_FORMAT`
+- **Severity Levels** — `info`, `minor`, `major`, `critical` with configurable thresholds
+- **Focus Areas** — `security`, `performance`, `bugs`, `best_practice`, `maintainability`
+- **Ignore Rules** — file patterns and rule-level exclusions
+- **Cross-platform** — Linux (x86_64, ARM64), macOS (Apple Silicon), Windows (x86_64)
+- **MIT License** — fully open source
+
+[Unreleased]: https://github.com/ajianaz/cora-cli/compare/v0.1.2...develop
+[0.1.2]: https://github.com/ajianaz/cora-cli/compare/v0.1.1...v0.1.2
+[0.1.1]: https://github.com/ajianaz/cora-cli/compare/v0.1.0...v0.1.1
+[0.1.0]: https://github.com/ajianaz/cora-cli/releases/tag/v0.1.0