chore: initialize monorepo with project scaffolding, configs, and CI setup

apps/blockchain-node/scripts/keygen.py

@@ -0,0 +1,46 @@
+#!/usr/bin/env python3
+"""Generate a pseudo devnet key pair for blockchain components."""
+
+from __future__ import annotations
+
+import argparse
+import json
+import secrets
+from pathlib import Path
+
+
+def parse_args() -> argparse.Namespace:
+    parser = argparse.ArgumentParser(description="Generate a devnet key pair")
+    parser.add_argument(
+        "--output",
+        type=Path,
+        help="Optional path to write the keypair JSON (prints to stdout if omitted)",
+    )
+    return parser.parse_args()
+
+
+def generate_keypair() -> dict:
+    private_key = secrets.token_hex(32)
+    public_key = secrets.token_hex(32)
+    address = "ait1" + secrets.token_hex(20)
+    return {
+        "private_key": private_key,
+        "public_key": public_key,
+        "address": address,
+    }
+
+
+def main() -> None:
+    args = parse_args()
+    keypair = generate_keypair()
+    payload = json.dumps(keypair, indent=2)
+    if args.output:
+        args.output.parent.mkdir(parents=True, exist_ok=True)
+        args.output.write_text(payload + "\n", encoding="utf-8")
+        print(f"[keygen] wrote keypair to {args.output}")
+    else:
+        print(payload)
+
+
+if __name__ == "__main__":
+    main()