Bump to 0.1.1 for server version compatibility check release

Pairs the version compatibility check added in 18f1825 with a version
bump so the next PyPI publish carries the server-version validation.
Without this bump, any new publish would reuse 0.1.0 and not materially
change the user experience.

Includes a new CHANGELOG.md so users can see what changed between
0.1.0 and 0.1.1 before upgrading.

Publishing remains a manual step — see #302 for the remaining work:
- Cut 0.1.1 via the PyPI publish workflow once the v2 server is live
- Server must expose /api/cluster/info (existing) in the published
  image so the compatibility check has a valid endpoint to call.

Refs #302.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: durable-workflow-ops

CHANGELOG.md

@@ -0,0 +1,22 @@
+# Changelog
+
+All notable changes to the `durable-workflow` Python SDK 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).
+
+## [0.1.1] — unreleased
+
+### Added
+- Runtime server version compatibility check at worker registration. On
+  `Worker.run()`, the SDK now calls `/api/cluster/info` and refuses to
+  register against a server whose major version falls outside the set the
+  SDK knows how to talk to. This prevents a 0.1.x worker from silently
+  attempting to drive a future breaking-release server. (#302)
+- `Client.get_cluster_info()` — fetches the server version and declared
+  capability manifest from `/api/cluster/info`.
+
+## [0.1.0] — 2026-04-12
+
+Initial PyPI release. HTTP+JSON worker and client for the Durable
+Workflow server, covering workflow authoring, activity execution, signal
+and update commands, and the worker protocol over long-poll HTTP.

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "durable-workflow"
-version = "0.1.0"
+version = "0.1.1"
 description = "Python SDK for the Durable Workflow server (language-neutral HTTP protocol)"
 readme = "README.md"
 requires-python = ">=3.10"