Added Changelog. #deploy#

Author: Visualq

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+
+## [0.2.0] - 2025-10-03
+
+### Added
+- **PHP 8+ Return Type Declarations** in arginfo:
+    - `KEM::keypair` → array
+    - `KEM::encapsulate` → array
+    - `KEM::decapsulate` → string
+    - `KEM::algorithms` → array
+    - `Signature::keypair` → array
+    - `Signature::sign` → string
+    - `Signature::verify` → bool
+    - `Signature::algorithms` → array
+- Added stricter return type reflection.
+
+### Changed
+- Memory cleanse now uses **`OQS_MEM_cleanse`** from liboqs. This keeps memory-zeroing consistent with liboqs.
+
+---
+
+## [0.1.0] - 2025-10-01
+
+### Added
+- Initial release of the **OQS PHP extension** (`oqs.so`).
+- Namespaced API under `OQS\KEM` and `OQS\Signature`.
+- Implemented KEM primitives:
+    - `keypair`, `encapsulate`, `decapsulate`, `algorithms`.
+- Implemented signature primitives:
+    - `keypair`, `sign`, `verify`, `algorithms`.
+- Constants: algorithm identifiers, `OQS\VERSION_TEXT`, `OQS\KEM_DEFAULT`, etc.
+- PHPT test suite covering key encapsulation and signatures.
+
+---