chore(demo-ext): release 0.7.0 (#9120)

Bump version.txt to 0.7.0 and add 0.7.0 CHANGELOG section covering copilot gRPC demo, provisioning/validation providers, Secret prompt option, and AI model lifecycle filtering.

Fixes #9121

Author: richardpark-msft

cli/azd/extensions/microsoft.azd.demo/CHANGELOG.md

@@ -1,5 +1,20 @@
 # Release History
 
+## 0.7.0 (2026-07-13)
+
+### Features Added
+
+- [[#7172]](https://github.com/Azure/azure-dev/pull/7172) Add a `copilot` command demonstrating the `CopilotService` gRPC service for extension-to-agent interactions.
+- [[#7482]](https://github.com/Azure/azure-dev/pull/7482) Add a demo provisioning provider showcasing the extension framework's provisioning-provider capability.
+- [[#8656]](https://github.com/Azure/azure-dev/pull/8656) Add the validation-provider capability with a sample preflight validation check.
+- [[#9019]](https://github.com/Azure/azure-dev/pull/9019) Add a provider-agnostic provision validation check example.
+- [[#7982]](https://github.com/Azure/azure-dev/pull/7982) Add a `Secret` option to prompts for masked input.
+- [[#7536]](https://github.com/Azure/azure-dev/pull/7536) Filter out deprecated AI models and surface version-level lifecycle status in the `ai` commands.
+
+### Bug Fixes
+
+- [[#7080]](https://github.com/Azure/azure-dev/pull/7080) Use `UserTenantId` for credential resolution.
+
 ## 0.6.0 (2026-03-04)
 
 ### Features Added

cli/azd/extensions/microsoft.azd.demo/version.txt

@@ -1 +1 @@
-0.6.0
+0.7.0