Add Hugging Face Space frontmatter and deploy docs for master branch

README frontmatter for BrainForge Docker Space (port 7860); gitignore frontend/.env.development; document pushing master to HF after merge from dev-cursor.

Co-authored-by: Cursor <cursoragent@cursor.com>

.gitignore

@@ -4,6 +4,7 @@ __pycache__/
 node_modules/
 frontend/build/
 backend/static/
+frontend/.env.development
 .DS_Store
 *.egg-info/
 dist/

README.md

@@ -1,3 +1,13 @@
+---
+title: Decidron Network Simulator
+emoji: 🔗
+colorFrom: blue
+colorTo: purple
+sdk: docker
+app_port: 7860
+pinned: false
+---
+
 # Decidron Network Simulator
 
 A deterministic, browser-based simulator for **Decidron networks** — the
@@ -238,6 +248,20 @@ frontend/
 Dockerfile, docker-compose.yml
 ```
 
+## Hugging Face Space (BrainForge)
+
+Hosted as a Docker Space on [BrainForge/decidron-simulator](https://huggingface.co/spaces/BrainForge/decidron-simulator) (`app_port: 7860`, `cpu-basic`). No API keys or secrets are required.
+
+Deploy from the **`master`** branch (merge `dev-cursor` into `master` on GitHub first):
+
+```bash
+git remote add hf https://huggingface.co/spaces/BrainForge/decidron-simulator
+git checkout master && git pull origin master
+git push hf master:main
+```
+
+The Space builds from the root `Dockerfile` (React frontend → `backend/static`, FastAPI on port 7860).
+
 ## Troubleshooting
 
 - **Port 7860 in use** — set `CCAI_HOST_PORT` in `.env`, or run uvicorn