AI Web App Completion Agent Creation

I want to build an AI Website & Web App Completion Agent that helps nontechnical founders finish their unfinished projects built using tools like Lovable, Bolt, Cursor, Claude, or Replit.

The platform should:

* Import existing projects via ZIP or GitHub.
* Use AI to inspect code and identify missing or broken features.
* Complete frontend, backend, Supabase, authentication, APIs, and payment integrations.
* Run the project in a secure sandbox, detect errors, fix bugs, and test the results.
* Help users deploy their completed applications.
* Provide a dashboard showing progress, code changes, errors, and test results.

Preferred tech stack: Next.js, Node.js, Supabase, an LLM API, GitHub integration, and a secure code-execution sandbox.

I want a working MVP, not just a chatbot that generates code. The agent must modify actual project files, run the application, verify fixes, and preserve rollback options.

Please share:

1. Your proposed architecture and development timeline.
2. Fixed-price MVP quotation.
3. Monthly hosting and AI API costs.
4. Your experience building AI coding agents and secure execution environments.