Author schema-valid evals/evals.json manifests (>=5 cases each) for the
tailscale sub-skills headscale-backup, headscale-deploy, headscale-derp,
headscale-node-lifecycle, headscale-routing, tailnet-policy, tailscale-client
and the workflow-architect sub-skills bundle-builder, interviewer, observer,
raising schema-valid coverage from 96/152 (63.2%) to 106/152 (69.7%). Remove
all 14 bundles/ entries from scripts/grandfathered-skills.txt now that the
8 umbrellas and 10 sub-skills all carry valid eval manifests.
Co-authored-by: factory-droid[bot] <138933559+factory-droid[bot]@users.noreply.github.com>