Remove discouraged lifecycle metadata blocks from skills
## Problem/Motivation
`docs/skill-authoring.md` explicitly states:
> The only Drupal-wide required frontmatter fields are the Agent Skills required fields: `name` and `description`. Do not require Drupal-specific frontmatter such as `drupal-version`, `status`, `owner`, or `last-reviewed`.
>
> Lifecycle, ownership, freshness, and package/version metadata should be handled by the owning project, issue or merge request process, release/package metadata, registry, or future package-manager conventions.
However, several existing skills ship a `metadata:` block containing exactly these discouraged fields (`status`, `drupal-version`, `last-reviewed`), and at least one skill's eval suite (`evals/drupal-render-pipeline/static-checks.json` S02) asserts those fields are *required* — directly contradicting the authoring guide.
Affected skills include at minimum:
- `skills/drupal-expert-corrections/SKILL.md`
- `skills/drupal-render-pipeline/SKILL.md`
## Proposed Resolution
1. Audit all skills under `skills/` for `metadata:` blocks containing discouraged fields.
2. Remove those blocks from each skill.
3. Update any eval static checks that assert those fields are required (e.g. `drupal-render-pipeline` S02) to instead assert only `name` and `description`.
4. Confirm all skills still pass the eval suite after removal.
## Who can work on this?
Novice-friendly — mechanical find-and-remove across skill files, with a straightforward eval fix. Good first issue for anyone familiar with the repo structure.
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