fix(core): correct UseFragmentResult type definition

[guendev]

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[Copilot]

Pull Request Overview

This PR fixes the UseFragmentResult type definition by converting it from a conditional generic type to a discriminated union, improving TypeScript type narrowing. It also includes documentation cleanup and a quote style fix in the operations package.

• Changed UseFragmentResult from a generic with conditional TCompleted parameter to a discriminated union based on the complete property
• Simplified and condensed documentation comments throughout useFragment.ts
• Updated quote style in operations package export

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
packages/core/src/composables/useFragment.ts	Refactored type definition to use discriminated union and streamlined documentation
packages/operations/src/codegen/index.ts	Changed export statement from single to double quotes
.changeset/slow-months-camp.md	Added changeset entry documenting the fix

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