Add Video Maker Executor script

[Nexorix-cell]

Implement Video Maker Executor with argument parsing and logging.

[rajpratham1]

This PR introduces a large new run.py (566 lines) that becomes a central execution entry point, but there are no accompanying tests or documentation updates to verify the expected behavior. For a script that handles CLI parsing, dependency validation, dynamic module loading, rendering, and error handling, I'd expect at least some validation of the new workflow before merging.

[rajpratham1]

This PR introduces a very large standalone run.py script (566 new lines) that duplicates responsibility already present in the project's tooling and execution flow. While the script is feature-rich and well documented, adding a new entry point of this size without tests or integration into the existing architecture makes it difficult to maintain.