Initial GPL-3.0 Release (v1.0.0)

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).
+
+## [1.0.0] - 2026-01-22
+
+This stable release marks the official launch of `sized` under the GNU General Public License v3.0.
+
+### Added
+- **Fast & Concurrent Analysis**: Multi-threaded directory traversal using `rayon` and `ignore`.
+- **Physical vs. Logical Distinction**: Accurate reporting of **Apparent Size** vs. **Disk Usage** (blocks).
+- **Unit & Precision Control**: Configurable unit systems (Binary/Decimal) and decimal precision.
+- **Advanced Filtering**: Filter by directory depth and minimum file size.
+- **Sorting**: Flexible sorting by name, type, size, or blocks.
+- **Gitignore Support**: Native support for `.gitignore` and `.ignore` files.
+- **Exporting**: Support for CSV and NDJSON output formats.
+- **Documentation**: Comprehensive standard Unix man pages and a detailed user guide.
+- **Shell Completions**: Automatic generation for Bash, Zsh, and Fish.
+- **Licensing**: GPL-3.0 to ensure the tool remains a shared public resource.