Document NordVPN failover plugin requirements

.gitignore

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+# Local configuration and secrets
+.env
+.secrets/
+config.local.*
+*.token
+*.key
+
+# OPNsense images and VM state
+*.img
+*.iso
+*.qcow2
+*.raw
+*.vmdk
+*.zvol
+.vagrant/
+.vm/
+
+# Build and test output
+work/
+dist/
+artifacts/
+coverage/
+*.log
+
+# Editor and agent state
+.claude/
+.codex/
+
+# Development journal
+docs/journal