docs: Update changelog for v0.1.1

Author: SanderMoon

CHANGELOG.md

@@ -5,6 +5,19 @@ All notable changes to Polysome will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [0.1.1] - 2025-12-23
+
+### Changed
+- **Renamed Package**: Canonical name changed from `Polysome` to `polysome` (lowercase) for consistency with Python standards.
+- **GUI Integration**: Prompt Editor is now integrated into the CLI via `polysome-gui`.
+- **Dependency Structure**: Introduced `[ui]` extra for minimal GUI install and `[all]` for full engine support.
+- **Default Model**: Updated example templates to use `google/gemma-3-4b-it`.
+
+### Fixed
+- **Jinja2 Syntax**: Corrected variable interpolation syntax in prompt templates.
+- **Workflow Error Handling**: Improved `Workflow.run` to correctly report node failures.
+- **CLI Scripting**: Fixed Bash arithmetic evaluation in integration test scripts.
+
 ## [0.1.0] - 2025-12-23
 
 ### Added
@@ -27,4 +40,5 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - **Prompt Editor**: Streamlit-based UI for designing and testing prompts (`polysome-prompt-editor`).
 - **Documentation**: Comprehensive guides for installation, workflows, prompt engineering, and docker usage.
 
+[0.1.1]: https://github.com/computationalpathologygroup/Polysome/releases/tag/v0.1.1
 [0.1.0]: https://github.com/computationalpathologygroup/Polysome/releases/tag/v0.1.0