skill(gva): forbid agent node-info collection in workflow

Require explicit cluster selection before GVA discovery

Make GVA scripts Bash 3 compatible (remove mapfile usage)

skill(gva): forbid existing node pool discovery

Document updated GVA preview CLI workflow in README

Add preview CLI workflow and IPv4-only subnet rule for GVA

Renumber filtered GVA menus to contiguous options

Standardize filtered GVA menu output format

Refine GVA menu flow and subnet validation rules

Refine GVA menu UX rules for AD and image filtering

Add mandatory VCN selection step to GVA menu UX

Update GVA deployer UX to one-by-one menu flow

Add kubeconfig context discovery to OKE troubleshooter preflight

Enhance OKE troubleshooter with dependency-aware latency workflow

Add smoke tests for script contracts with mocks