v0.3.20

Fixes

• Agent update "no binary available": Release asset parser now recognizes both agent-linux-amd64 and klever-agent-linux-amd64 naming conventions. Older CI-built releases use the klever-agent- prefix, newer manual releases use agent-.
• Node delete removes Docker container: Delete now sends node.remove to the agent before cleaning up the DB record. Prevents ghost nodes from re-appearing via auto-discovery.

Full Changelog: v0.3.19...v0.3.20