Update README.md

[code-forge-temple]

This PR adds:

• Agentic Signal - Visual AI agent workflow automation platform with local LLM integration. Build intelligent workflows using drag-and-drop, no cloud dependencies.
• ScribePal - Chrome extension that uses local LLMs to assist with writing and drafting responses based on the context of your open tabs.
• Local LLM NPC - Godot 4.x asset that enables NPCs to interact with players using local LLMs for structured, offline-first learning conversations in games.

I've added them under the General-Purpose Machine Learning - Misc section.