OpenClaw 2026.5.x writes agents[].model as either a plain string
or as an object { primary, fallbacks }. The status enrichment and
POST cleanup both called .startsWith() on the raw value, which threw
TypeError when the object form was present and made the dashboard
report 'not configured'.
Add a resolveAgentModel helper that accepts both shapes and returns
the string id (model.primary for the object form, empty string for
missing/invalid). Use it when enriching agents in GET so consumers
receive a string model field, and when filtering the list in POST.
Refs decolua/9router#1196
a168313290