feat(schema): add ValidateEnums for --validate path

[danmrichards]

Add ValidateEnums to check string fields with oneOf/enum constraints against the payload. Called alongside ValidateRequired and ValidateAllOf when --validate is set, giving consistent client-side errors for invalid enum values (e.g. settings.thinking=true) before the API is reached.

[Copilot]

Pull request overview

This PR adds client-side enum validation to the --validate path so that string fields constrained by JSON Schema oneOf (const branches) or enum are rejected early with a clear error, before the request reaches the API.

Changes:

• Add ValidateEnums to recursively validate string enum constraints across objects/arrays in payloads.
• Wire ValidateEnums into Client.Run alongside existing ValidateRequired and ValidateAllOf when --validate is enabled.
• Expand schema unit tests to cover enum validation behavior (including nested oneOf and direct enum cases).

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
internal/schema/schema.go	Adds ValidateEnums implementation and simplifies empty-segment detection in ParseKV.
internal/schema/schema_test.go	Adds/updates tests covering enum validation and ParseKV behavior with/without enum constraints.
internal/api/client.go	Invokes ValidateEnums during --validate and simplifies minResults clamping logic.

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[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

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