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)