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.

.github/pull_request_template.md

@@ -0,0 +1,4 @@
+<!-- Note: Our primary focus is supporting Bitcoin, and contributions in that regard are appreciated the most!
+Due to historical reasons, ElectrumX also has support for many altcoins. These will be kept as long as
+maintenance burden can be kept *at a minimum*. When adding a new altcoin, (1) add a unit test (see tests/blocks),
+and (2) make sure the CI tests pass. -->