hal0 v0.7.3-beta.2

Second beta in the 0.7.3 line. Vision lands on the chat slot, idle slots
finally give their RAM back, and the Operator Board stops crashing on
task creation.

Added

• Chat-slot vision — mmproj sidecars are now associated with their parent
  model in the registry, the container provider emits --mmproj from that
  sidecar, and vision auto-surfaces as a capability with a per-slot toggle.
  (#899, #900, #901)
• TTL-driven hard eviction — idle slots are now unloaded after their timeout,
  freeing resident RAM instead of merely relabelling READY→IDLE. (#902)
• Hermes memory authorship — writes from Hermes are stamped with an
  agent:hermes author tag. (#912)

Fixed

• Operator Board no longer black-screens (React #31) when adding a task;
  modal styling, drag-to-delete, and the agent-chat drawer are reworked, and
  board chat now runs on the agent slot instead of the (wedged) chat slot.
  (#905, #914, #916)
• Slot MTP gate hardened on the backend and NUL bytes stripped from
  model-modal inputs. (#918)
• Memory rejects anonymous private writes (stops private__anonymous
  misrouting). (#915)
• Memory banks grid fills its width again, unnested from the section
  title row. (#911)
• ComfyUI reads slot logs from journald and reworks its card layout. (#909)

Changed

• Docs mirrored from hal0-web.