feat(agent) : replacing langchain with langgraph

[EncHawk]

Including nodes, enhancing relevant tools that are related to the individual agents.

embedding the following architecture which gets rid of langchain and replaces it with a non-linear graph like execution

AGENT.py contents will be fully removed as a result of this change, introducing a recursive agentic loop that generates mp4's with diffusion and manim included in a single mp4 output.

[EncHawk]

This will also deprecate the use of flowcharts in the user-feedback loop, but will exist as a standalone tool for execution without the agentic framework, i.e synchronously, an object string is generated.