docs(mcp): Add PROMPTING_GUIDE.md for effective LLM discourse

README.md

@@ -158,3 +158,4 @@ The LLM agent interacts with your active Neovim session using a dedicated set of
 - **Clipboard Watch Mode (	oggle_clipboard_watch_mode)**: Background daemon thread that auto-ingests your Ctrl+C clipboard activity directly into Knowledge Graph StickyNotes while you debug.
 - **Ghost Text Previews (
 vim_set_preview)**: Pushes proposed LLM code diffs directly into Neovim buffers as ephemeral virtual text.
+- [Prompting Guide & Effective Discourse](./PROMPTING_GUIDE.md): Learn how to phrase prompts to get the most out of the agent and memory server.