Generate a probe skeleton from an uncovered cell (slice 4)
Drive the layer-5 probe-corpus growth. Each invocation produces (or refreshes) a probe-skeleton YAML at lineage/{repo}/probes/{P-NNN}.yaml. The skeleton carries enough scaffolding for the maintainer to fill in the arrange / act / observe / assert blocks with the specific behaviour the probe pins; the cross-references + frontmatter are pre-populated from feature-flows.yaml.
This skill is the maintainer-facing entry point for the can
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