Own identity and versioning: plm-electrumx 1.0.0

Package name plm-electrumx, project URLs, keywords and description for
Palladium. BRANDING and the version string seen by clients (server.version,
banner, logs) become plm-electrumx 1.0.0. SECURITY.md points to this
repository's private vulnerability reporting.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

.gitignore

@@ -22,3 +22,5 @@
 
 .coverage
 /htmlcov/
+/src/plm_electrumx.egg-info/
+/plm_electrumx.egg-info/