Docs: Add CHANGELOG and bump version to 0.4.0

partitioning/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).
+
+## [0.4.0] - 2025-12-16
+### Added
+- **Monitoring**: Added `--discovery` argument for Zabbix Low-Level Discovery (LLD) of partitioned tables.
+- **Monitoring**: Added `--check-days` argument to calculate days remaining until partition buffer exhaustion.
+- **CLI**: Added `--version` / `-V` flag to display script version.
+- **Docker**: Added `RUN_MODE=discovery` and `RUN_MODE=check` support to `entrypoint.py`.
+- **Templates**: Added Zabbix 7.0 compatible template `zabbix_partitioning_template.yaml`.
+
+### Removed
+- **CLI**: Removed unimplemented `--delete` / `-d` argument.
+
+## [0.3.0] - 2025-12-14
+### Changed
+- **Refactor**: Complete rewrite of `zabbix_partitioning.py` using Class-based structure (`ZabbixPartitioner`).
+- **Configuration**: Switched to YAML configuration file (`zabbix_partitioning.conf`).
+- **Safety**: Added checks to prevent partitioning of tables incompatible with Zabbix 7.0 schema (e.g., `auditlog` without `clock` in PK).
+- **Docker**: Introduced Docker container support (`Dockerfile`, `entrypoint.py`).
+
+### Added
+- **Optimization**: Added `initial_partitioning_start` option (`db_min` vs `retention`) to speed up initialization on large DBs.
+- **Reliability**: Use `pymysql` with robust connection handling and SSL support.