- Drop all Linux capabilities by default (CapDrop: ALL) - Enable read-only root filesystem (agents write to mounted /workspace volume) - Limit process count to 100 to prevent fork bombs (PidsLimit) - Add no-new-privileges security option to prevent privilege escalation - Add DockerSecurityOptions type with configurable security settings - All options are configurable via config but secure by default - Add comprehensive tests for security hardening options (20+ new tests) Refs #338 Co-Authored-By: Claude Opus 4.5 <[email protected]>