chore: prepare 0.2.0 release notes and version bump.

Author: lyndonbauto

CHANGELOG.md

@@ -7,6 +7,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [0.2.0] - 2026-05-28
+
 ### Added
 
 - Per-user session manifest (`app:user:sl`) and bin-projected `list_sessions(app, user)` metadata reads.
@@ -23,6 +25,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - `AerospikeSessionService.list_sessions` with `user_id` reads the session manifest instead of scanning `idx_*_sess_uid`.
 - Inline event codec bumped to v2: full `Event.model_dump` stored under `payload` for lossless round-trip (v0/v1 records remain readable).
 
+### Fixed
+
+- Concurrent `save_artifact` calls allocate distinct versions via atomic `operate` on a per-file head record (`:__head__`).
+
 ## [0.0.1] - 2026-05-27
 
 ### Added
@@ -32,4 +38,6 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - `aerospike://` URI support via `adk_aerospike.register()`.
 - Chunked session records, server-side lexical memory search, and composite tenant indexes.
 
+[Unreleased]: https://github.com/aerospike-community/adk-aerospike/compare/v0.2.0...HEAD
+[0.2.0]: https://github.com/aerospike-community/adk-aerospike/compare/v0.0.1...v0.2.0
 [0.0.1]: https://github.com/aerospike-community/adk-aerospike/releases/tag/v0.0.1

README.md

@@ -4,7 +4,7 @@
 
 Aerospike-backed storage services for [Google Agent Development Kit (ADK)](https://adk.dev/).
 
-**Status:** alpha (0.0.1). All three ADK storage interfaces implemented end-to-end against ADK 2.x.
+**Status:** alpha (0.2.0). All three ADK storage interfaces implemented end-to-end against ADK 2.x.
 
 ## What's in here
 

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "adk-aerospike"
-version = "0.0.1"
+version = "0.2.0"
 description = "Aerospike-backed Session, Memory, and Artifact services for Google Agent Development Kit (ADK)."
 readme = "README.md"
 license = { text = "Apache-2.0" }

src/adk_aerospike/__init__.py

@@ -28,4 +28,4 @@
     "register",
 ]
 
-__version__ = "0.0.1"
+__version__ = "0.2.0"