Prepare v0.1.0 release

Author: Focaxis Dev

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+## [0.1.0] - 2026-04-19
+
+- Initial public release of Deja Vu.
+- Added the familiarity-first semantic recall engine core.
+- Added in-memory storage and vector adapters for zero-infrastructure local trials.
+- Added runnable examples for basic recall, agent PM, chat memory, and task assistant flows.
+- Added AI-readable integration docs, handshake guidance, and project rules templates.
+