form-compile now warns when model uses runtime types like
FormDataStructure that don't exist in XML schema. Expanded cfg:
regex to cover all 25 known prefixes.
form-validate adds Check 12 — validates all <v8:Type> values:
ERROR for known-invalid types, WARN for unrecognized bare types,
pass-through for unknown namespaced types (future-proof).
Updated SKILL.md with full type reference and invalid type warning.
Updated docs/1c-form-spec.md with missing type groups.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>