v0.9.0

Changelog

• a90af13: feat: schema-as-documentation contract for --json (v0.9.0) (@gdameneses)
• 20dded6: feat(cmd): enforce typed-flag enums at Cobra layer (--format, --wait-until) (@gdameneses)
• a01c3b3: feat(api): route InvalidOptions to ErrValidation + smoke for v0.9.0 contract (@gdameneses)
• cc1bbd0: Merge branch 'feature/schema-as-docs' for v0.9.0 (@gdameneses)