Greptile Summary

This PR adds explicit exported TypeScript types (ChatAbortTestContext and ChatAbortRespondMock) to the chat abort test helpers file, replacing inferred types (ReturnType<typeof createChatAbortContext> and ReturnType<typeof vi.fn>) that were leaking Vitest internal spy types into the module's export surface. The invokeChatAbortHandler function is also updated to return Promise<ChatAbortRespondMock> instead of Promise<void>, making the returned mock directly usable for typed assertions in consuming tests.

• Adds ChatAbortTestContext as an explicitly typed interface for the test context object, intersecting Record<string, unknown> to preserve compatibility with the overrides spread pattern.
• Adds ChatAbortRespondMock = Mock<RespondFn> to expose a properly typed respond mock, replacing the untyped ReturnType<typeof vi.fn>.
• Updates invokeChatAbortHandler return type from implicit Promise<void> to Promise<ChatAbortRespondMock>, enabling callers to do type-safe assertions on mock call arguments (e.g. the ok: boolean first argument of RespondFn).
• Imports RespondFn from ./types.js to support the new ChatAbortRespondMock type.

Confidence Score: 5/5

• This PR is safe to merge — it is a pure type-annotation improvement with no runtime behavior changes.
• All changes are restricted to TypeScript type declarations and exported type aliases. No logic, runtime behavior, or test assertions are modified. The explicit types accurately reflect the runtime shapes already present in the file, and replacing inferred Vitest-internal types with explicit ones is a strictly additive improvement to the public API surface of this test-helper module.
• No files require special attention.

_{Last reviewed commit: f531c4e}