v0.0.6

Review hardening from a full re-review. The VMAF quality gate now fails closed when the score can't be computed (libvmaf missing, ffmpeg error, resolution mismatch) instead of replacing the original anyway. The worker skips a source that already probes as the target codec, which self-corrects a job re-queued after a crash mid-replace. Fixed a 10-bit pixel-format false positive (yuv410p is 8-bit, not 10-bit). Added logging for a corrupt job queue and for permission (chmod/chown) failures, which matters on TrueNAS/SMB. Sealed the API controller. Also adds docs/COMPARISON.md comparing this plugin to Tdarr, Unmanic, FileFlows and HandBrake.