fix(athena): include MODE=all agents in uiSelectedModel passthrough

The general-agents.ts isPrimaryAgent check only considered mode=primary,
causing Athena (now mode=all) to lose uiSelectedModel resolution.
Also adds metadata tests for non-interactive triggers.

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-opencode)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

src/agents/builtin-agents/general-agents.ts

@@ -67,7 +67,7 @@ export function collectPendingBuiltinAgents(input: {
       }
     }
 
-    const isPrimaryAgent = isFactory(source) && source.mode === "primary"
+    const isPrimaryAgent = isFactory(source) && (source.mode === "primary" || source.mode === "all")
 
     let resolution = applyModelResolution({
       uiSelectedModel: (isPrimaryAgent && override?.model === undefined) ? uiSelectedModel : undefined,