feat(language): implicitly convert enum references to arrays

[sanny-io]

Closes #1211

Summary by CodeRabbit

• New Features

  • Added enum-based validation for string fields, supporting checks against all values in an enum.
  • Added support for enum-constrained model fields, including valid and invalid status handling.
  • Added address type validation with RESIDENTIAL and COMMERCIAL values.

• Bug Fixes

  • Improved enum reference resolution and generated validation expressions for consistent schema behavior.

[coderabbitai]

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Reviewing files that changed from the base of the PR and between cba0348 and 08e706a.

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• packages/zod/test/factory.test.ts

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📝 Walkthrough

Walkthrough

Changes

Enum declarations can now be used in validation membership expressions. The linker resolves enum references as arrays, and the TypeScript schema generator emits their values. Zod and ORM tests cover valid and invalid enum values.

Enum validation support

Layer / File(s)	Summary
Resolve enum references packages/language/src/zmodel.langium, packages/language/src/zmodel-linker.ts, packages/language/test/attribute-application.test.ts	Enum declarations are valid reference targets and resolve as non-nullable array expressions. Schema loading accepts enum membership validation.
Generate enum membership expressions packages/sdk/src/ts-schema-generator.ts, packages/cli/test/ts-schema-gen.test.ts	Enum references generate arrays containing the enum name and all enum fields. Tests verify the generated in expression.
Validate generated Zod enum fields packages/zod/test/schema/schema.zmodel, packages/zod/test/schema/schema.ts, packages/zod/test/factory.test.ts	Address.type uses AddressType membership validation. Tests cover inference, valid values, invalid values, and updated fixtures.
Exercise ORM enum validation tests/e2e/orm/schemas/enum/schema.zmodel, tests/e2e/orm/schemas/enum/schema.ts, tests/e2e/orm/client-api/enum.test.ts	The SQLite ORM schema adds PostStatus validation. End-to-end tests cover three valid statuses and one invalid status.

Estimated code review effort: 3 (Moderate) | ~25 minutes

Merge Risk: ⚪ Minimal · up to 08e70

The PR adds implicit conversion of enum references to arrays across language and generated-schema behavior, with supporting test updates. No actionable merge-blocking risk remains in the supplied evidence; it is merge-ready after normal checks and review.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly describes the primary change: implicit conversion of enum references to arrays.
Linked Issues check	✅ Passed	The changes support enum references in validation rules, the in operator, synchronized enum values, and primitive fields as required by issue #1211.
Out of Scope Changes check	✅ Passed	The implementation and tests are directly related to enum validation support and issue #1211 objectives.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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packages/zod/test/factory.test.ts

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Actionable comments posted: 1

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Inline comments:
In `@packages/zod/test/factory.test.ts`:
- Around line 608-618: Update the invalid-enum test for Address so its zip field
uses a value valid under the schema’s zip validation, isolating the failure
assertion to the invalid type value UNKNOWN while preserving the existing test
structure.

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ℹ️ Review info

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Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

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Run ID: acf86cf7-7056-4b76-9e51-cbc5574562d9

📥 Commits

Reviewing files that changed from the base of the PR and between 1390aa0 and 59bbadc.

⛔ Files ignored due to path filters (2)

• packages/language/src/generated/ast.ts is excluded by !**/generated/**
• packages/language/src/generated/grammar.ts is excluded by !**/generated/**

📒 Files selected for processing (11)

• packages/cli/test/ts-schema-gen.test.ts
• packages/language/src/zmodel-linker.ts
• packages/language/src/zmodel.langium
• packages/language/test/attribute-application.test.ts
• packages/sdk/src/ts-schema-generator.ts
• packages/zod/test/factory.test.ts
• packages/zod/test/schema/schema.ts
• packages/zod/test/schema/schema.zmodel
• tests/e2e/orm/client-api/enum.test.ts
• tests/e2e/orm/schemas/enum/schema.ts
• tests/e2e/orm/schemas/enum/schema.zmodel

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