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.

docs/authors.rst

@@ -0,0 +1,20 @@
+.. _Authors:
+
+Authors
+=======
+
+* Neil Booth
+
+  Original creator, past maintainer.
+
+* Electrum developers
+
+  Current maintainers.
+
+* Johann Bauer
+
+  Backend DB abstraction.
+
+* John Jegutanis
+
+  Alt-chain integrations.