Remove Type system — delete schema classes, registries, and old signature

Acceptance Criteria

• createComponentRenderable only accepts the new inline { rune, schemaOrgType?, ... } signature — old Type overload removed
• Type, TypeFactory, and useSchema deleted from packages/types/src/schema/index.ts
• All ~35 schema class files in packages/runes/src/schema/ deleted
• All schema class files in community packages (runes/*/src/schema/) deleted
• packages/runes/src/registry.ts deleted (or reduced to only non-Type exports if any exist)
• RuneDescriptor.type field removed — only typeName and schemaOrgType remain
• Rune class no longer references Type
• @refrakt-md/types no longer exports schema classes (Page, Hint, etc.)
• All tests pass
• TypeScript compiles cleanly across the entire monorepo
• A changeset is created for the breaking change

Scope

• ~35 schema class files to delete in packages/runes/src/schema/
• ~30 schema class files to delete across runes/*/src/schema/ (9 community packages)
• ~10 registry/index files to update
• 1 function signature to simplify (createComponentRenderable)
• 1 interface to simplify (RuneDescriptor)
• 1 class to simplify (Rune)
• Barrel export cleanup in packages/types/src/index.ts and packages/runes/src/index.ts

Approach

1. Remove the Type overload from createComponentRenderable — keep only the inline signature
2. Delete all schema/ directories: packages/runes/src/schema/ and each runes/*/src/schema/
3. Delete or gut packages/runes/src/registry.ts
4. Remove Type, TypeFactory, useSchema from packages/types/src/schema/index.ts
5. Clean up RuneDescriptor — remove type?: Type field
6. Remove schema class re-exports from barrel files
7. Run full build (npm run build) and fix any remaining references
8. Run full test suite (npm test)
9. Create changeset documenting the breaking change

References

• Replace the useSchema / Type class system with plain rune identifiers (Phase 3)
• Add dual-signature support to createComponentRenderable and update RuneDescriptor (dependency — dual-signature support)
• Migrate core runes to inline rune identifiers (dependency — core rune migration)
• Migrate community package runes to inline rune identifiers (dependency — community rune migration)
• Update inspect tooling for string-based rune types (dependency — tooling update)