Update version to 4.1.1 in pyproject.toml and finalize changelog for release

Author: grongierisc

CHANGELOG.md

@@ -5,7 +5,7 @@ All notable changes to this project 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).
 
-## [Unreleased]
+## [4.1.1] - 2026-07-22
 ### Added
 - Add `iop --install-agent-guidance` to install version-matched IoP guidance,
   skills, and offline cookbooks into existing application repositories for

pyproject.toml

@@ -3,7 +3,7 @@ requires = ["setuptools", "wheel"]
 
 [project]
 name = "iris_pex_embedded_python"
-version = "4.1.1b2"
+version = "4.1.1"
 description = "Iris Interoperability based on Embedded Python"
 readme = "README.md"
 requires-python = ">=3.10"