Rename skill directory and frontmatter name from
`explaining-batch-data-transform` to `data-cloud-bdt-expert`
per internal PR reviewer feedback. A noun-form name (identifies
the skill by what it's about) is clearer than a gerund-form name
(describes what it does) for user-facing plugin/skill identity.
- skills/explaining-batch-data-transform/ -> skills/data-cloud-bdt-expert/
- SKILL.md frontmatter `name:` updated
- tests docstring path updated
No behavior change. All 92 tests pass.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
