Update changelog with unreleased changes

Author: robinheghan

CHANGELOG.md

@@ -5,6 +5,34 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/)
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [Unreleased]
+
+### Added
+
+- **CLI Enhancements**:
+  - Added `packageNameParser` and `semanticVersionParser` to `Cli.Parser`
+  - Support for `--flag value` argument format in addition to `--flag=value`
+  - Improved error handling and help text generation
+
+- **Compiler.Outline improvements**:
+  - Added `readFromPath` function with proper error handling for reading `gren.json` files
+  - Enhanced `findSourceFiles` with validation for module names and file contents
+  - Added comprehensive error types: `ReadFromPathError` and `FindSourceFilesError`
+
+- **New Modules**:
+  - `Compiler.Package` for reading packages from file system and `Stream`s
+
+### Changed
+
+  - Moved from `CLI` to `Cli` module naming convention
+  - Replaced `Task.sequence` with `Task.concurrent` for better parallelism in file operations
+  - Optimized source file scanning and validation
+
+- **Documentation**:
+  - Reformatted CHANGELOG to use Keep a Changelog format
+  - Updated README to clarify package purpose and functionality
+  - Several modules have been moved to the `gren-lang/compiler-common` package
+
 ## [3.0.7] - 2025-09-08
 
 ### Changed