Initial commit: snapshot of spesmilo/electrumx 2.0.0

Unmodified source tree of upstream commit 280cb339aa158e099eb936033eecd15719770651
("Merge pull request #389 from SomberNight/202607_release_2_0",
https://github.com/spesmilo/electrumx, release 2.0.0, 3 July 2026).

All Palladium-specific changes are in the commits that follow.

electrumx_rpc

@@ -0,0 +1,11 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 ; mode: python -*-
+import os
+import sys
+
+
+if __name__ == '__main__':
+    src_dir = os.path.join(os.path.dirname(__file__), "src")
+    sys.path.insert(0, src_dir)
+    from electrumx.cli.electrumx_rpc import main
+    sys.exit(main())