docs(changelog): add initial unreleased notes

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/1.1.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+A `### Breaking` section is used in addition to Keep a Changelog's standard sections to explicitly document changes that are backwards-incompatible but would otherwise appear under `### Changed`. Entries under `### Breaking` trigger a major version bump in automated release recommendation logic.
+
+## [Unreleased]
+
+### Breaking
+
+### Added
+
+- Initial standalone releaseprep migration into vociferate.
+- Configurable version source and parser via `--version-file` and `--version-pattern`.
+- Configurable changelog path via `--changelog`.
+- Composite action (`action.yml`) for release preparation and recommendation flows.
+- Gitea workflows for push validation and manual release preparation.
+
+### Changed
+
+### Fixed
+
+### Removed