ServiceRadar v1.4.39

Turns on SNMP table walks from the control plane, adds the NCO
validation-run API, and lands the farm01-tested dashboard, trap, and
addon-exec fixes.

Whats New

1.4.39

• SNMP: opt-in walk mode on the agent collector (GETBULK/GETNEXT,
  row and time bounds). Empty proto mode stays GET. (PR #3803)
• SNMP: profiles can set OID mode, max_rows, and
  walk_timeout_seconds through the control plane. (PR #3809)
• NCO: POST/GET /api/v1/validation-runs re-probes hosts from a
  composite check's vantage agents. (PR #3807)
• Dashboard: renderer preferences persist on reload. (PR #3805)
• Dashboard: operations layout fills the leftover hole between the
  map and the side panels. (PR #3812)
• Plugins: changing a producer schedule's cadence, cron, or timezone
  recomputes next_due_at. (PR #3804)
• Agent: ScaLibr and Bumblebee exec unsticks on SELinux Enforcing.
  (PR #3811)
• Traps: trapd publishes source_ip and a human-readable body.
  (PR #3813)
• Config: unified configuration schema, rule set, and managers.
  (PR #3789)
• Wasm plugins consume github.com/carverauto/serviceradar-sdk-go
  v0.3.0. (PR #3808)