fix(worma): handle array schema without items in ast parser

[SAY-5]

When an OpenAPI array schema omits items, arrayTypeParser passes undefined into ctx.next, which reaches getParserSchemaType and throws Cannot read properties of undefined (reading 'type') during worma gen. An array without items is valid (items are unconstrained), so this crashes codegen on otherwise valid documents.

This defaults the missing items to an empty schema {}, matching how objectTypeParser already falls back with schema.properties || {}. Added a regression test in test/parsers/array.spec.ts for the itemless-array case.

Fixes #830

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