Complete v1.21.3 changelog

Co-authored-by: rajeshkamal5050 <[email protected]>

Author: Copilot

cli/azd/.vscode/cspell.yaml

@@ -140,6 +140,7 @@ overrides:
       - creds
       - Moby
       - upsert
+      - jfomhover
   - filename: docs/proxy-configuration.md
     words:
       - Telerik

cli/azd/CHANGELOG.md

@@ -1,15 +1,25 @@
 # Release History
 
-## 1.22.0-beta.1 (Unreleased)
+## 1.21.3 (2025-11-14)
 
 ### Features Added
 
-### Breaking Changes
+- [[#6185]](https://github.com/Azure/azure-dev/pull/6185) Add support for processing model resources as parameters in AI Agents extension.
+- [[#6158]](https://github.com/Azure/azure-dev/pull/6158) Add support for deploying Aspire apps to App Service deployment slots.
+- [[#6143]](https://github.com/Azure/azure-dev/pull/6143) Add support for multi-agent projects with environment variables for agent metadata.
 
 ### Bugs Fixed
 
+- [[#6190]](https://github.com/Azure/azure-dev/pull/6190) Fix default infrastructure settings being incorrectly written to `azure.yaml` files.
+- [[#6191]](https://github.com/Azure/azure-dev/pull/6191) Fix local pointer handling in AI Agents extension.
+- [[#6186]](https://github.com/Azure/azure-dev/pull/6186) Fix prompting during provision/deploy in AI Agents extension.
+- [[#6187]](https://github.com/Azure/azure-dev/pull/6187) Fix agent playground URL encoding in AI Agents extension.
+- [[#6176]](https://github.com/Azure/azure-dev/pull/6176) Fix panic when container settings are undefined during predeploy.
+
 ### Other Changes
 
+- [[#6183]](https://github.com/Azure/azure-dev/pull/6183) Improve exception messages with actionable guidance in AI Agents extension. Thanks @jfomhover for the contribution!
+
 ## 1.21.2 (2025-11-13)
 
 ### Features Added

cli/version.txt

@@ -1 +1 @@
-1.22.0-beta.1
+1.21.3