fix(helm): handle nil cfg in agentFullname for NOTES.txt compatibility

[thepagent]

Description

Fix nil pointer panic in openab.agentFullname when called without cfg in the template dict (e.g. from NOTES.txt).

Steps to Reproduce

helm install with nameOverride set — NOTES.txt calls agentFullname with dict "ctx" $ "agent" $name (no cfg), causing a nil dereference.

Fix

Guard .cfg.nameOverride with a nil check on .cfg first:

{{- if and .cfg (.cfg.nameOverride) (ne .cfg.nameOverride "") }}

[github-actions]

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