```

chore: enhance .gitignore and remove obsolete documentation files

- Reorganize .gitignore with categorized sections for better maintainability
- Add comprehensive ignore patterns for Python, Node.js, databases, logs, and build artifacts
- Add project-specific ignore rules for coordinator, explorer, and deployment files
- Remove outdated documentation: BITCOIN-WALLET-SETUP.md, LOCAL_ASSETS_SUMMARY.md, README-CONTAINER-DEPLOYMENT.md, README-DOMAIN-DEPLOYMENT.md
```

scripts/gpu/gpu_miner_demo.py

@@ -0,0 +1,60 @@
+#!/usr/bin/env python3
+"""
+GPU Miner Registration Demo
+Shows what data would be sent to register the GPU
+"""
+
+import json
+from datetime import datetime
+
+# GPU Information from nvidia-smi
+GPU_INFO = {
+    "miner_id": "localhost-gpu-miner",
+    "capabilities": {
+        "gpu": {
+            "model": "NVIDIA GeForce RTX 4060 Ti",
+            "memory_gb": 16,
+            "cuda_version": "12.4",
+            "compute_capability": "8.9",
+            "driver_version": "550.163.01"
+        },
+        "compute": {
+            "type": "GPU",
+            "platform": "CUDA",
+            "supported_tasks": ["inference", "training", "stable-diffusion", "llama"],
+            "max_concurrent_jobs": 1
+        }
+    },
+    "concurrency": 1,
+    "region": "localhost"
+}
+
+print("=== GPU Miner Registration Data ===")
+print(json.dumps(GPU_INFO, indent=2))
+print("\n=== Registration Endpoint ===")
+print("POST http://localhost:8000/miners/register")
+print("\n=== Headers ===")
+print("Authorization: Bearer REDACTED_MINER_KEY")
+print("Content-Type: application/json")
+print("\n=== Response Expected ===")
+print("""
+{
+  "status": "ok",
+  "session_token": "abc123..."
+}
+""")
+
+print("\n=== Current GPU Status ===")
+print(f"Model: NVIDIA GeForce RTX 4060 Ti")
+print(f"Memory: 16GB (2682MB/16380MB used)")
+print(f"Utilization: 9%")
+print(f"Temperature: 43°C")
+print(f"Status: Available for mining")
+
+print("\n=== To Start the GPU Miner ===")
+print("1. Ensure coordinator API is running on port 8000")
+print("2. Run: python simple_gpu_miner.py")
+print("3. The miner will:")
+print("   - Register GPU capabilities")
+print("   - Send heartbeats every 15 seconds")
+print("   - Poll for jobs every 3 seconds")