fix(kimi): add missing required arrays to tool schemas

[cuipengcx90]

Related Issue

Related to #792 and #1610, but addresses a distinct schema-validation case.

PR #1720 sanitizes entries in an existing required array. This PR handles object schemas where the required property is absent.

Problem

Standard JSON Schema permits object schemas to omit required. Kimi-compatible APIs apply stricter Moonshot-flavored JSON Schema validation and may reject tool definitions before execution with required must be an array when a root or nested object node omits the property.

Kimi Code already normalizes local references and missing type fields for this provider, but it forwards missing required properties unchanged.

What changed

• Add required: [] to explicitly typed or inferred object nodes only when the property is absent.
• Preserve existing required values, including invalid values that should remain visible to downstream validation.
• Apply the same normalization in the Kosong and agent-core-v2 Kimi provider paths.
• Cover root objects, nested properties, array items, allOf/anyOf/oneOf branches, existing and invalid required values, non-object schemas, input immutability, and provider request conversion.
• Add a patch changeset for @moonshot-ai/kimi-code.

Validation

• Kosong suite: 1,283 tests passed.
• Kimi-focused suites: 147 tests passed.
• agent-core-v2 suite: 3,694 tests passed; one unrelated timing-sensitive plan event snapshot failed in the full parallel run and passed when rerun in isolation.
• Root pnpm typecheck: passed.
• Root pnpm lint: exited successfully; changed files have zero warnings and zero errors under type-aware lint.
• git diff --check: passed.

Checklist

• I have read the CONTRIBUTING document.
• I have linked a related issue, or explained the problem above.
• I have added tests that prove my feature works.
• Ran gen-changesets skill, or this PR needs no changeset.
• Ran gen-docs skill, or this PR needs no doc update.

[changeset-bot]

🦋 Changeset detected

Latest commit: 29164b0

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@moonshot-ai/kimi-code	Patch

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[chatgpt-codex-connector]

Treat undefined required as missing

When a tool schema is built with an own required: undefined property (for example from a computed optional schema field), this guard treats it as present and skips adding []; the OpenAI client serializes JSON with undefined fields omitted, so the Kimi request still goes out without any required array and hits the same required must be an array rejection. The mirrored agent-core-v2 normalizer has the same guard, so both provider paths need to consider undefined missing while still preserving other invalid values if desired.

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