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## Summary by CodeRabbit
* **Refactor**
* Request sanitization now includes an extra proxy-specific
preprocessing step for safer AI proxying.
* **New Features**
* Initialization prompts centralized into a shared helper, with a
web-specific prompt variant.
* Authenticated requests can optionally route via a provided external
API key to access alternate models.
* **Chores**
* Added and exposed a preprocessing hook with a default no-op
implementation.
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## Summary by CodeRabbit
## Documentation
* Updated setup instructions across all documentation to clarify that
the publishable client key is only required when your project
configuration enforces it, removing confusion about unconditional
requirements.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
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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.
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