feat: normalize emails

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [0.2.0] - 2025-12-04
+
+### Added
+
+- Email header normalization to ensure RFC 5322 compliance
+- New `normalize-imap` binary tool to fix existing malformed emails in IMAP inbox
+- IMAP fetch functionality to retrieve all messages from inbox
+- IMAP delete and expunge functionality for message management
+- Dry-run mode for the normalization tool (`--dry-run` flag)
+- Confirmation prompts with skip option (`--yes` flag)
+- Comprehensive email header continuation line fixing
+- Analysis and reporting of which emails need normalization
+
+### Changed
+
+- Refactored project structure to use library + multiple binaries
+- Main binary renamed to `pop-to-imap` for clarity
+- All modules made public for library usage
+- Updated README with detailed usage instructions for both tools
+
+### Fixed
+
+- Email headers with missing whitespace on continuation lines now properly formatted
+- RFC 5322 Section 2.2.3 compliance for header folding
+
+## [0.1.0] - 2025-12-03
+
+### Added
+
+- Initial release
+- POP3 to IMAP email migration
+- TLS/SSL support for secure connections
+- Environment-based configuration via .env files
+- Docker support with multi-stage builds
+- Basic error handling and logging