feat: add environment requirements checker

tools/env_checker.py

@@ -0,0 +1,41 @@
+#!/usr/bin/env python3
+"""RustChain Environment Checker — Verify system requirements for mining."""
+import platform, shutil, sys, os, subprocess
+
+REQUIREMENTS = {
+    "Python": ("3.8", platform.python_version()),
+    "OS": ("any", platform.system()),
+    "Architecture": ("any", platform.machine()),
+    "Git": ("any", shutil.which("git")),
+    "Pip": ("any", shutil.which("pip") or shutil.which("pip3")),
+    "Curl": ("any", shutil.which("curl")),
+}
+
+def check():
+    print("RustChain Environment Check")
+    print("=" * 45)
+    all_ok = True
+    for name, (req, val) in REQUIREMENTS.items():
+        ok = val is not None and val != ""
+        print(f"  {'OK' if ok else 'FAIL':>4}  {name:<15} {val or 'NOT FOUND'}")
+        if not ok: all_ok = False
+
+    # Check disk space
+    disk = shutil.disk_usage("/")
+    free_gb = disk.free / (1024**3)
+    ok = free_gb > 5
+    print(f"  {'OK' if ok else 'WARN':>4}  {'Disk Free':<15} {free_gb:.1f} GB")
+
+    # Check internet
+    try:
+        import urllib.request
+        urllib.request.urlopen("https://rustchain.org/health", timeout=5)
+        print(f"  {'OK':>4}  {'Internet':<15} Connected")
+    except:
+        print(f"  {'FAIL':>4}  {'Internet':<15} No connection")
+        all_ok = False
+
+    print(f"\n{'Ready to mine!' if all_ok else 'Fix issues above before mining.'}")
+
+if __name__ == "__main__":
+    check()