docs: add CHANGELOG with initial release

🤖 Generated with Claude Code

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: ranaroussi

CHANGELOG.md

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+# Changelog
+
+All notable changes to Envapor are documented here.
+
+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]
+
+## [0.1.0] - 2026-07-15
+
+### Added
+
+- Initial release. Transparent encryption of `.env` values in Git via clean/smudge
+  filters, a pre-commit guard, AES-256-GCM with HKDF-derived subkeys, and
+  deterministic, context-bound `ENC[v2:...]` tokens for readable diffs and clean
+  merges. Includes `keygen`, `keys`, `init`, `status`, `doctor`, `encrypt`,
+  `decrypt`, and `migrate` commands, a first-party GitHub Action, install scripts
+  for macOS/Linux/Windows, and an agent skill.
+
+[Unreleased]: https://github.com/automazeio/envapor/compare/v0.1.0...HEAD
+[0.1.0]: https://github.com/automazeio/envapor/releases/tag/v0.1.0