refactor: organize scripts/, remove stale root dirs, clean up structure

scripts/ reorganization:
- Sort 14 loose root scripts into subfolders:
  blockchain/ (genesis, proposer, mock chain, testnet BTC)
  dev/ (CLI wrapper, dev services, OpenAPI gen, systemd setup, domain proxy)
  ops/ (coordinator proxy, remote tunnel)
  gpu/ (miner workflow)
- Merge scripts/testing/ into scripts/test/ (eliminate duplicate folder)
- Create scripts/examples/ for usage demos and simulations

Root-level cleanup:
- Move home/ (12 simulation scripts) → scripts/examples/
- Move dev-utils/ (2 files) → scripts/dev/
- Move protocols/receipts/sample → tests/fixtures/
- Delete stale src/ (duplicate of apps/blockchain-node/src/)
- Remove empty home/, dev-utils/, protocols/ directories

Documentation updates:
- Update docs/6_architecture/8_codebase-structure.md tree and table
- Update root README.md tree to reflect new structure

scripts/test/verify_windsurf_tests.py

@@ -0,0 +1,64 @@
+#!/usr/bin/env python3
+"""
+Verify Windsurf test integration is working properly
+"""
+
+import subprocess
+import sys
+import os
+
+def run_command(cmd, description):
+    """Run a command and return success status"""
+    print(f"\n{'='*60}")
+    print(f"Testing: {description}")
+    print(f"Command: {cmd}")
+    print('='*60)
+    
+    result = subprocess.run(cmd, shell=True, capture_output=True, text=True)
+    
+    if result.stdout:
+        print("STDOUT:")
+        print(result.stdout)
+    
+    if result.stderr:
+        print("STDERR:")
+        print(result.stderr)
+    
+    return result.returncode == 0
+
+def main():
+    print("🔍 Verifying Windsurf Test Integration")
+    print("=" * 60)
+    
+    # Change to project directory
+    os.chdir('/home/oib/windsurf/aitbc')
+    
+    tests = [
+        ("pytest --collect-only tests/test_windsurf_integration.py", "Test Discovery"),
+        ("pytest tests/test_windsurf_integration.py -v", "Run Simple Tests"),
+        ("pytest --collect-only tests/ -q --no-cov", "Collect All Tests (without imports)"),
+    ]
+    
+    all_passed = True
+    
+    for cmd, desc in tests:
+        if not run_command(cmd, desc):
+            all_passed = False
+            print(f"❌ Failed: {desc}")
+        else:
+            print(f"✅ Passed: {desc}")
+    
+    print("\n" + "=" * 60)
+    if all_passed:
+        print("✅ All tests passed! Windsurf integration is working.")
+        print("\nTo use in Windsurf:")
+        print("1. Open the Testing panel (beaker icon)")
+        print("2. Tests should be automatically discovered")
+        print("3. Click play button to run tests")
+        print("4. Use F5 to debug tests")
+    else:
+        print("❌ Some tests failed. Check the output above.")
+        sys.exit(1)
+
+if __name__ == "__main__":
+    main()