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.

tests/lib/test_env_base.py

@@ -0,0 +1,49 @@
+# Tests of server/env.py
+
+import os
+
+import pytest
+
+from electrumx.lib.env_base import EnvBase
+
+
+os.environ.update({
+    'int': '32',
+    'intspace': ' 32 ',
+    'true': 'x',
+    'false': '',
+    'space': ' ',
+})
+
+def test_default():
+    e = EnvBase()
+    assert e.default('int', '33') == '32'
+    assert e.default('baz', 'z') == 'z'
+
+def test_boolean():
+    e = EnvBase()
+    assert e.boolean('true', False)
+    assert not e.boolean('false', True)
+    assert not e.boolean('space', True)
+    assert e.boolean('missing', True)
+    assert not e.boolean('missing', False)
+
+def test_required():
+    e = EnvBase()
+    assert e.required('true') == 'x'
+    with pytest.raises(e.Error):
+        e.required('missing')
+
+def test_integer():
+    e = EnvBase()
+    assert e.integer('int', 33) == 32
+    assert e.integer('missing', 33) == 33
+    assert e.integer('intspace', 33) == 32
+    assert e.integer('missing', None) is None
+    with pytest.raises(e.Error):
+        e.integer('true', 1)
+
+def test_obsolete():
+    e = EnvBase()
+    with pytest.raises(e.Error):
+        e.obsolete(['z', 'space'])