Accept Ankh runtime devtools dependency

[artiphishle]

Summary

• accept @ankhorage/devtools from dependencies for @ankhorage/ankh
• keep the existing devDependencies requirement for ordinary public packages
• reject the misplaced devDependency form for @ankhorage/ankh
• add focused regression coverage for both dependency placements
• add a patch changeset

Why

@ankhorage/ankh bundles @ankhorage/devtools as a runtime core provider. After ankh devtools sync, Doctor incorrectly reported package.dependencies.devtools.required because its policy only checked devDependencies.

This aligns Doctor with the devtools package-sync contract so aggregate ankh devtools sync and ankh doctor validate . agree on the required placement.