Headless execution for running Deepnote notebooks

[Artmann]

Create a Python CLI tool in deepnote-toolkit that enables headless execution of Deepnote notebooks with parameter support. This will be used for automation, CI/CD, and running notebooks from the command line.

Parameter Support

Support passing parameters to notebooks. Notebooks can have input blocks (cells with type: "input"), and CLI parameters should be injected as variables before execution.

Environment Handling

• Use the current Python environment by default
• Support pointing to a specific virtual environment
• Optional environment validation against notebook requirements

Execution

• Synchronous execution (wait for completion)
• Use Deepnote Kernel for execution
• Return appropriate exit codes (0=success, non-zero=failure)