feat(webAgent): diagnose why a generation returned no tool call (#637) #959

Job	Run time
Check secret availability	3s
detect-changes	6s
setup	49s
extension	56s
Smoke eval (Pilo agent on example.com)	1m 7s
Release build	59s
server	36s
cli	33s
core	1m 2s
	6m 11s

Provide feedback