📝 initial release docs

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 uses date-based versioning (YYYY.MM.DD).
+
+## [Unreleased]
+
+### Added
+### Changed
+### Deprecated
+### Removed
+### Fixed
+### Security
+
+## [2025.11.15] - 2025-11-15
+
+### Added
+- Initial version tracking system
+- `version.py` module for source code version reference
+- `VERSION` file at project root for easy access
+- HTML meta tag (`generator`) displaying version in page source
+- Version number injected into all template contexts
+- This CHANGELOG.md file to track version history
+- Version bump script (`scripts/bump_version.py`) to automate releases
+
+[Unreleased]: https://git.puercito.net/mi/sunday/compare/v2025.11.15...HEAD
+[2025.11.15]: https://git.puercito.net/mi/sunday/releases/tag/v2025.11.15