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/ACKNOWLEDGEMENTS

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+Thanks to Thomas Voegtlin for creating the Electrum software and
+infrastructure and for maintaining it so diligently.  Electrum is
+probably the best desktop Bitcoin wallet solution for most users.  My
+faith in it is such that I use Electrum software to store most of my
+Bitcoins.
+
+Whilst the vast majority of the code here is my own original work and
+includes some new ideas, it is very clear that the general structure
+and concept are those of Electrum.  Some parts of the code and ideas
+of Electrum, some of which it itself took from other projects such as
+Abe and pywallet, remain.  Thanks to the authors of all the software
+this is derived from.
+
+I'd like to thank bauerj, hsmiths and JWU42 of #electrum for their
+help and support in testing the versions of ElectrumX prior to 1.0.
+
+Thanks to Daniel Bernstein for daemontools and other software, and to
+Matthew Dillon for DragonFlyBSD.  They are both deeply inspirational
+people.
+
+And of course, thanks to Satoshi for the wonderful creation that is
+Bitcoin.