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<!-- This is an auto-generated comment: release notes by coderabbit.ai
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## Summary by CodeRabbit
* **New Features**
* Interactive init workflow (create, link-config, link-cloud) with safe
non-interactive behavior; writes/updates project config and .env, and
prints STACK AUTH setup instructions.
* CLI assistant/agent with a progress UI for long-running tasks.
* Backend AI proxy endpoint that validates and forwards AI requests to
an external provider.
* **Tests**
* End-to-end tests covering all init modes, outputs, env linking, and
error cases.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
## Release Notes
* **New Features**
* Added Stack CLI with authentication (login/logout) commands.
* Added project management commands to list and create projects.
* Added configuration management to pull and push project settings.
* Added code execution capability to run JavaScript expressions.
* Added initialization command for Stack Auth setup.
* **Tests**
* Added comprehensive end-to-end test suite for CLI functionality.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
