Heimdall v0.8.2 Security Fix Requires Immediate Upgrade

heimdall v0.8.2 released for Polygon Mainnet. Contains security fix, mirroring v0.8.2-priv private release. All node operators must upgrade immediately for compatibility and network safety. Upgrade steps: stop heimdalld, install via script with network mainnet and node type, verify version prints 0.8.2, restart service. Changelog compares v0.8.1 to v0.8.2.